Answer:
THE STANDARD HEAT OF FORMATION FOR C3H8 IS 9.59 KJ/MOL.
Explanation:
Mass = 5 g of C3H4
Mass of water = 15 kg
Initial temperature of water = 25 C = 25 + 273 K = 298 K
Final temperature of water = 3.688 C = 3.688 + 273 K = 276.688 K
We may make the assumptions that:
1. the specific heat of water = 4.2 J/Kg K
2. total mass of the reaction mixture = 15 kg of water + 5 g of C3H8
= 15.005 Kg
Temperature change = 298 - 276.688 = 21.312 K
heat change for the reaction
Heat = mass * specific heat * change in temperture
Heat = 15.005 * 4.2 * 21.312
Heat = 1343.10 J
EQUATION
C3H8 + 5O2 -> 3CO2 + 4H2O + heat
Number of mole = mass / molar mass
Molar mass of HCl = 36.5 g/mol
Number of mole = 5 g/ 36.5 g/mol
Number of mole = 0.14 moles
5 g of C3H8 produces 1343.10 J of heat
0.14 mole of C3H8 produces 1343.10 J
1 mole of C3H8 will produce 1343.10 / 0.14 J of heat
= 9593.57 J
= 9.59 kJ of heat.
The standard heat of formation for C3H8 is 9.59 kJ/mol.
Copper is a solid phase of copper still unknown to science. The only difference between it and ordinary copper is that Copper forms a crystal with a bcc unit cell and a lattice constant . Calculate the density of Copper . Round your answer to significant digits.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The density is [tex]\rho = 8.21479 g/cm^3[/tex]
Explanation:
From the question we are told that
the lattice constant is [tex]a = 0.295 nm = 0.295*10^{-9} = 0.295*10^{-7} cm[/tex]
The density of Copper ([tex]\beta[/tex]) is mathematically represented as
[tex]\rho = \frac{ZM}{a^3N_A}[/tex]
Where Z is the number of units in a unit cell and for BCC crystals Z =2
M is the molar mass of copper which same for Copper with a value of
[tex]M = 63.5 g/mol[/tex]
[tex]N_A[/tex] is the Avogadro's constant with a value of [tex]N_A = 6.022*10^{23}[/tex]
Substituting values
[tex]\rho = \frac{2 *63.5}{(0.295*10^{-7})^3 * (6.022*10^{23})}[/tex]
[tex]\rho = 8.21479 g/cm^3[/tex]
Which pathogen do you think responds faster to treatments provided by doctors? Explain your reasoning.
ANSWER: From experience and observation, the pathogen that responds more faster to treatments are PARASITES.
This is because, our body are already used to parasite, as they feed and mostly live inside our body. Parasites becomes harmful to our body, when it is allowed to be much in the body, thereby weakening the immune system of the body. Intake of vaccination reduces the number of parasites in the body, which gives the immune system the chance of recovering and protecting the body.
Parasite does not replicate more faster like viruses and other pathogens. These makes it more easier for treatment to work more faster. They are also easily killed by taking the proper treatment, and the rate of their replications are very slow when compared to the rate of their death when vaccinated.
Some example disease caused by parasites are:
1) Giardiasis
2) Trichomoniasis
3) Malaria
4) Toxoplasmosis
5) Intestinal worms
6) Pubic lice
All this disease above responds very fast to medical treatment, unless when they is complications, which are mostly when the parasite has been allowed to cause more harm and replicate much in the body, without any treatment. This is why doctors advice patients that lives at the tropical regions to periodically vaccinate themselves on parasitic infections.
1. A 99.8 mL sample of a solution that is 12.0% KI by mass (d: 1.093 g/mL) is added to 96.7 mL of another solution that is 14.0% Pb(NO3)2 by mass (d: 1.134 g/mL). How many grams of PbI2 should form?
Pb(NO3)2(aq) + 2 KI(aq) PbI2(s) + 2 KNO3(aq)
Answer:
[tex]m_{PbI_2}=18.2gKI[/tex]
Explanation:
Hello,
In this case, the undergoing chemical reaction is:
[tex]2KI+Pb(NO_3)_2\rightarrow 2KNO_3+PbI_2[/tex]
Thus, we proceed to compute the reacting moles of Pb(NO3)2 and KI, by using the given concentrations and densities and molar masses which are 331.2 g/mol and 166 g/mol respectively:
[tex]n_{Pb(NO_3)_2}=96.7mL*\frac{1.134g}{mL}*\frac{0.14gPb(NO_3)_2}{1g}*\frac{1molPb(NO_3)_2}{331.2gPb(NO_3)_2} =0.0464molPb(NO_3)_2\\\\n_{KI}=99.8mL*\frac{1.093g}{mL}*\frac{0.12gKI}{1g}*\frac{1molKI}{166gKI} =0.0789molKI[/tex]
Next, the 0.0464 moles of Pb(NO3)2 will consume the following moles of KI (consider their 1:2 molar ratio):
[tex]n_{KI}^{consumed\ by\ Pb(NO_3)_2}=0.0464molPb(NO_3)_2*\frac{2molKI}{1molPb(NO_3)_2} =0.0928molKI[/tex]
Hence, as only 0.0789 moles of KI are available, KI is the limiting reactant, therefore the formed grams of PbI2, considering its molar mass of 461.01 g/mol and 2:1 molar ratio, are:
[tex]m_{PbI_2}=0.0789molKI*\frac{1molPbI_2}{2molKI} *\frac{461.01gPbI_2}{1molPbI_2} \\\\m_{PbI_2}=18.2gKI[/tex]
Best regards.
How many grams of \text{NaCl}NaClstart text, N, a, C, l, end text will be produced from 18.0 \text{ g}18.0 g18, point, 0, start text, space, g, end text of \text{Na}Nastart text, N, a, end text and 23.0 \text{ g}23.0 g23, point, 0, start text, space, g, end text of \text{Cl}_2Cl
2
start text, C, l, end text, start subscript, 2, end subscript?
Answer:
18.7887 g of NaCl
Explanation:
The question reads - How many grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2?
Let us start by writing out the balanced equation of the reaction:
Na + Cl2 ---> NaCl2
1 mole, each of Na and Cl2 is required to produce 1 mole of NaCl.
mole = mass/molar mass
Therefore
18 g of Na = 18/23 = 0.7826 mole
23 g of Cl2 = 23/71 = 0.3239 mole
In this case, the Na is in excess and the Cl2 becomes the limiting reagent. Hence
0.3239 mole of Cl2 will react with 0.3239 mole of Na to yield 0.3239 mole of NaCl.
mass of 0.3239 mole NaCl = 0.3239 x 58 = 18.7887 g
Hence, 18.7887 grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2.
Select the statements that correctly describe a buffer. a) An acid added to the buffer solution reacts with the weak base of the buffer. b) The pH of a buffer solution is determined by the ratio of the concentration of conjugate base to the concentration of strong acid. c) A buffer is generally made up of a weak acid and its conjugate base. d) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. e) The Ka of a buffer does not change when any amount of an acid is added to the buffer solution.
Answer:
(B.) The pH of a buffer solution is determined by the ratio of the concentration of conjugate base to the concentration of strong acid.(C.) A buffer is generally made up of a weak acid and its conjugate base. (D.) The pH of a buffer solution does not change significantly when any amount of a strong acid is added.Explanation:
A buffer is solution which resists change in pH upon addition of either acids or bases.
The pH of a buffer is calculated by the ratio of the concentration of base to concentration of acid. The weak acid and conjugate base have a Ka similar to the pH desired.
Statements that are correctly describe a buffer are buffer is generally made up of a weak acid and its conjugate base, pH and Ka of a buffer solution does not change significantly.
What is buffer solution?Buffer solution is a mixture of a weak acid and its conjugate base or weak base with its conjugate acid.
Buffer solutions resists the value of pH of the solution whenever small quantity of strong acid or strong base is added on it. pH of the buffer solution will be calculated by using the Henderson Hasselbalch equation as follow:
For weak acids-
pH = pka + log [conjugate base]/[weak acid]
For weak base-
pH = pka + log [conjugate acid]/[weak base]
Ka is the acid dissociation constant which is not changes too much for the buffer solution.
Hence options (C), (D) and (E) are correct.
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In the covalent compound C3H8 the Greek prefix used to represent the cation is?
Answer:the answer is DI
Explanation:APΣX
What would the final salt concentration be if instead of placing the dialysis bag in 4.0 L of distilled water for 12 h, you placed the bag in 1.0 L of distilled water for 6.0 h and then in another 1.0 L of fresh distilled water for another 6.0 h
Answer:chicken
Explanation:There are many types of chicken
What is the chemical formula for the compound formed between sodium and sulfur?
Answer:
The formula for sodium sulfide is Na2S.
Answer:
NA2S
Explanation:
the compound formed was sodium sulphide
therefore the chemical formula is NA2S
What element is missing in the following nuclear equation? bismuth radon lead polonium
Answer:
Lead
Explanation:
Lead (Pb) has atomic number 82
Ex Polonium (Po) has atomic number 84 and mass number 212
Answer:
lead
Explanation:
(a) Show that the pressure exerted by a fluid P (in pascals) is given by P = hdg, where h is the column of the fluid in metres, d is the density in kg/m-3, and g is the acceleration due to gravity (9.81 m/s2). (Hint: See Appendix 2.). (b) The volume of an air bubble that starts at the bottom of a lake at 5.24C increases by a factor of 6 as it rises to the surface of water where the temperature is 18.73C and the air pressure is 0.973 atm. The density of the lake water is 1.02 g/cm3. Use the equation in (a) to determine the depth of the lake in metres.
Answer:
B) THE DEPTH OF THE LAKE IS 0.060 m
Explanation:
b) Determine the depth of the lake in metres
1. Using the general gas law, we will calculate the initial pressure of the air bubbles.
P1V1 /T1 = P2V2/T2
P1 = Unknown
T1 = 5.24 °C
T2 = 18.73 °C
P2 = 0.973 atm
V1 = V1
V2 = 6V1
P1 = P2 V2 T1 / V1 T2
P1 = 0.973 * 6V1 * 5.24 / V1 * 18.73
P1 = 5.09852 * 6 / 18.73
P1 = 30.59112 / 18.73
P1 = 1.633 atm.
2. Calculate the depth of the lake:
Pressure = length * density * acceleration
length = Pressure / density * acceleration
Pressure = 1.633 atm = 1.633 * 101, 325 Nm^2 = 165, 463.725 Nm^2
Density = 1.02 g/cm3 = 1.02 * 10^3 kg/m^3
Acceleration = 9.8 m/s^2
So therefore, the length in metres is:
Length = density * acceleration / pressure
Length = 1.02 *10^3 * 9.8 / 165, 463.725
Length = 9.996 * 10^3 / 165 463.725
Length = 0.06 m
Hence, the depth of the lake is 0.06 m
2 upper N upper o upper c l double-headed arrow 2 upper N upper O (g) plus upper C l subscript 2 (g).
At equilibrium, the concentrations are as follows.
[NOCl] = 1.4 ´ 10–2 M
[NO] = 1.2 ´ 10–3 M
[Cl2] = 2.2 ´ 10–3 M
Answer: The equilibrium constant for the reaction is 0.000016.
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric coefficients.
The given balanced equilibrium reaction is,
[tex]2NOCl(g)\rightleftharpoons 2NO(g)+Cl_2(g)[/tex]
The expression for equilibrium constant for this reaction will be,
[tex]K_c=\frac{[NO]^2[Cl_2]}{[NOCl]^2}[/tex]
Now put all the given values in this expression, we get :
[tex]K_c=\frac{(1.2\times 10^{-3})^2\times (2.2\times 10^{-3})}{(1.4\times 10^{-2})^2}[/tex]
[tex]K_c=0.000016[/tex]
Thus the equilibrium constant for the reaction is 0.000016.
Solution A is a 1.00 L buffer solution that is 1.188 M in acetic acid and 1.188 M in sodium acetate. Acetic acid has a pKa of 4.74. What is the pH change of this solution upon addition of 0.1 mol of HCl? Enter your answer numerically to four decimal places. It will be a negative number.
Answer:
pH change is -0.07
Explanation:
Using H-H equation for acetic acid:
pH = pKa + log [Acetate salt] / [Acetic acid]
Replacing:
pH = 4.74 + log[1.188M] / [1.188M]
pH = 4.74
The HCl reacts with sodium acetate producing acetic acid, thus:
HCl + CH₃COONa → CH₃COOH + NaCl
That means the final moles of sodium acetate are initial moles - moles of HCl and moles of acetic acid are initial moles + moles of HCl.
As the volume of the buffer is 1.0L, initial moles of both substances are 1.188moles. After reaction, the moles are:
sodium acetate: 1.188mol - 0.1mol = 1.088mol
Acetic acid: 1.188mol + 0.1mol = 1.288mol
Using again H-H equation:
pH = 4.74 + log[1.088M] / [1.288M]
pH = 4.67
pH change is: 4.67 - 4.74 = -0.07
The number of moles of O2 in 10.6 grams of Na2CO3:
A. 0.1 moles
B. 0.3 moles
C. 0.2 moles
D. None of these
Explain please
I NEED HELP PLEASE, THANKS!
Solids, liquids and gases are the three most commonly accepted phases of matter. Explain the properties of each phase, including their relative energy.
Answer:
Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.
Explanation:
Answer:
Liquids properties include retention of volume and its conformation to the shape of its container. The
particles in a liquid have more kinetic energy than the particles in the corresponding solid. Solids are
structurally rigid and resist changing shape or volume. Solid particles have the least amount of kinetic
energy. Properties of gas include easily compressible, the expand to fill their container and they occupy
more space than a solid or liquid. Gas particles have the most amount of kinetic energy
Explanation:
Is water the most common acid?
Answer: Yes
Explanation: Since strong acids react with and use up water molecules, and strong bases do not
Which of the following changes would increase the pressure of a gas in a closed
container?
a) More gas is added
b) Temperature is increased
c) The container's size is increased
d) Part of the gas is removed
e) Temperature is decreased
f) The container's size is decreased
Answer:
a) More gas is added
b) Temperature is increased
f) The container's size is decreased
Explanation:
For an ideal gas, pressure is jointly proportional to temperature and the quantity of gas, and inversely proportional to the volume. Then pressure will increase for ...
a) More gas is added
b) Temperature is increased
f) The container's size is decreased
What is the color of litmus solution in sodium chloride?
The answer would be blue litmus red
Arrange the following compounds in order of increasing solubility in water and explain your sequence: C7H15OH, C6H13OH, C6H6, C2H5OH
Answer:
C6H6 < C7H15OH < C6H13OH < C2H5OH
Explanation:
Hello,
In this case, since the organic molecules solubility is defined in terms of the presence of hydrogen bonds as intermolecular forces, which are formed between oxygen and hydrogen and the length of the organic chain, we can notice that hydroxyl-containing longer chains tend to be less water soluble whereas shorter chains more soluble as the polar part of the chain will lead the solubility. In addition to it, chains with lack of oxygen tend to be highly water insoluble. Therefore, we can notice that C6H6 is the least water soluble, next C7H15OH, then C6H13OH and the most soluble is C2H5OH.
Best regards.
How can you use a red cabbage solution to determine the ph of a solution
Answer:
(PH color chart at the bottom)
Chop the cabbage into small pieces until you have about 2 cups of chopped cabbage. Place the cabbage in a large beaker or other glass container and add boiling water to cover the cabbage. Allow at least 10 minutes for the color to leach out of the cabbage. Alternatively, you can place about 2 cups of cabbage in a blender, cover it with boiling water, and blend it.
Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7. The exact color you get depends on the pH of the water.
Pour about 50–100 mL of your red cabbage indicator into each 250 mL beaker.
Add various household solutions to your indicator until it changes color. Use separate containers for each household solution—you don't want to mix chemicals that don't go well together.
2=Red
4=Purple
6=Violet
8=Blue
10=Blue Green
12 = Green Yellow
Karla added green pellets to a container of water before she began watering her lawn. What correctly describes
the solvent in her solution.
The green pellets are the solvent because it is dissolved in water.
The water is the solvent because it is dissolved in the green pellets.
The water is the solvent because the green pellets dissolved in it.
The green pellets are the solvent because it dissolved the water.
The correct answer is C. The water is the solvent because the green pellets dissolved in it.
Explanation:
In solutions, the are two substances involved, the solvent and the solute. The solvent is usually a liquid substance; additionally, the solvent dissolves another substance, which is known as the solute. For example, if you dissolve a spoon of salt in a glass of water, the solute is the salt which is the substance dissolved and the solvent is the water because the solute is dissolved in it. According to this, in the case presented the water is the solvent because the green pellets which are the solute dissolve in it.
A mountain has a height of 2.74 miles. How high is the mountain in meters? Use the fact that 1 mi=1.609 km .
kkknskndcnndcks
a
Answer:
Explanation:
4) list 3 protest rights you have that are protected under the law. How can you protect these rights? George Floyd’s ?
Help me please urgent
The correct value according to Ruler A is 2.2cm, whereas the correct value according to Ruler B is 2.27 cm.Perform the mathematical operations indicated by the title of each bin using these two values. Round the correct answers to the appropriate number of significant figures or decimal places. Compare the rounded correct answers with the values given and drag the rounded correct answers to the bin that represents the mathematical operation performed. There are also answers that are not rounded to the correct number of significant figures or decimal places. Drag these answers to the bin named �Incorrect rounding.�For example, multiply the number 2.2 by 2.27. Round the answer to the appropriate number of significant figures. Drag the correctly rounded answer to the bin labeled "2.2 x 2.27"Drag the incorrect answers from the multiplication operation to the bin named "Incorrect rounding."Drag the appropriate items to their respective bins.Item: 5.0 cm^2, 4.994 cm^2, 4.5cm, 0.0cm, 4.47cm, 0.07cm, 0.1cm, 1.0, 1, 1, 10.3, 4.99cm^21. 2.27x2.2 =?2. 2.27/2.2 =?3. 2.27 +2.2 = ?4. 2.27-2.2 = ?5. Incorrect rounding?
Answer:
1) 5.0 cm² ( to two significant figures or one decimal place)
2) 1.0 (to two significant figures or to one decimal place)
3) 4.5 cm ( to two significant figures or one decimal place)
4) 0.1 cm ( to two significant figures or one decimal place)
5) The remaining answers due to incorrect rounding are 4.994 cm², 0.0 cm, 4.47 cm, 0.07 cm, 1, 1.03 cm, 4.99 cm²
Explanation:
The answers given are rounded to two significant figures or one decimal places:
1) 2.27*2.2 = 5.0 cm² ( to one decimal place)
2) 2.27/2.2= 1.0 ( to one decimal place)
3) 2.27+2.2 = 4.5 cm ( to one decimal place)
4) 2.27-2.2 = 0.1 cm ( to one decimal place)
5) The remaining answers due to incorrect rounding are 4.994 cm², 0.0 cm, 4.47 cm, 0.07 cm, 1, 1.03 cm, 4.99 cm²
How many K atoms are there in 5K2CO3?
Select one:
15
10
6
2
Answer:
10
Explanation:
The 5 will multiply the subscript 2 on the K atoms making it 10
Which formula represents a salt?
KOH
KCl
CH3OH
CH3COOH
Answer:
kci represents the formula of salt
KCl exists potassium chloride made of potassium and chloride. They are considered salt because they form K+ and Cl- ions, not OH- or H+ ions.
What is meant by chemical equation?
Chemical equations are symbolic depictions of chemical reactions in which the reactants and products are stated in terms of their corresponding chemical formulae.
Chemical equations, which are expressions that list the names and amounts of the chemicals involved in a process, are used to describe chemical reactions. The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation.
KCl exists potassium chloride made of potassium and chloride. They are considered salt because they form K+ and Cl- ions, not OH- or H+ ions. Also, they are colorless and taste bitter.Therefore, the correct answer is option b) KCl.
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15.00 mL of 0.425 M H2SO4 solution is required to completely react with (neutralize) 23.9 mL
of KOH solution.
What is the
molarity of the KOH solution?
2 KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2 H20 (1)
Answer:
0.533 M KOH
Explanation:
2 KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2 H20 (l}
from reaction 2 mol 1 mol
x 15*10^(-3)*0.425 mol
15.00 mL = 15*10^(-3)L H2SO4 solution
15*10^(-3)L*0.425 mol/L = 15*10^(-3)*0.425 mol H2SO4
x =2*15*10^(-3)*0.425/1 = 2*15*10^(-3)*0.425 mol KOH
23.9mL = 23.9 *10^(-3) L KOH
M(KOH) - molarity KOH
M(KOH)*V(KOH solution) = M(KOH)*23.9 *10^(-3) L KOH - is moles KOH
2*15*10^(-3)*0.425 mol H2SO4 = M(KOH)*23.9 *10^(-3) L KOH
M(KOH) = 2*15*10^(-3)*0.425 /(23.9 *10^(-3)) = 0.533 M
Rank the following substances in order from most soluble in water to least soluble in water: methane, CH4; 2-butanol, C4H9OH; potassium chloride, KCl; and propane, C3H8. Rank from most to least soluble in water. To rank items as equivalent, overlap them.
Answer:
Arranged in order of most soluble to least soluble in water:
[tex]KCl > CH_{4} > C_{4} H_{9} OH > C_{3}H_{8}[/tex]
Explanation:
Water is a polar solvent due to the electric charge it possesses. Hence it would only dissolve polar molecules.
Non-polar molecules would be dissolved by non-polar solvents.
Short chain alcohols are more soluble than butanol, but generally the polar -OH group is soluble in water.
It has two substances, muriatic acid and sodium hydroxide. Which of the two substances would you use to unclog the pipes? Please argue your answer.
Answer:
Sodium hydroxide
Out of the two substances, sodium hydroxide would you use to unclog the pipes.
What is the use of sodium hydroxide?Sodium hydroxide is used to produce soaps, rayon, paper, products that explode, dyes, and petroleum products.
The presence of sodium hydroxide in a cleanser or in a homemade aqueous solution converts these pesky fats into soaps and the soap is then easily removed by water.
Hence, out of the two substances, sodium hydroxide would you use to unclog the pipes.
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You are performing an experiment which requires you to add 2.00 grams of benzene to a reaction. Benzene has a density of 0.790 g/mL. You should add:
a. 2.53 mL
b. 0.395 mL
c. 1.58 mL
d. 2.00 mL
Answer:
a. 2.53 mL
Explanation:
Hello,
In this case, by knowing the density is defined as the ratio of the mass to the volume:
[tex]\rho =\frac{m}{V}[/tex]
Since both the mass and density of benzene are given, we can easily compute the volume by solving for it:
[tex]V=\frac{m}{\rho}=\frac{2.00g}{0.790g/mL}\\ \\V=2.53mL[/tex]
Therefore the answer is a. 2.53 mL .
Best regards.
Answer:
a. 2.53 mL
Explanation:
The density is an intensive property, that is, it does not depend on the system size or the amount of material in the system. At a given temperature, the density of a liquid is constant, so it can be used to identify a substance.
The density (ρ) results from the quotient between the mass (m) of the liquid and its volume (V). We can use this expression to find the volume corresponding to 2.00 grams of benzene (ρ = 0.790 g/mL).
ρ = m / V
V = m / ρ
V = 2.00 g / (0.790 g/mL)
V = 2.53 mL
u make 1.000 L of an aqueous solution that contains 35.0 g of sucrose (C12H22O11).Part AWhat is the molarity of sucrose in this solution?Express your answer to three significant figures.M
Answer:
0.102 M
Explanation:
Given data
Mass of sucrose (solute): 35.0 gVolume of solution: 1.000 LStep 1: Calculate the moles of solute
The molar mass of sucrose is 342.3 g/mol. The moles corresponding to 35.0 g of sucrose are:
[tex]35.0g \times \frac{1mol}{342.3g} =0.102mol[/tex]
Step 2: Calculate the molarity of sucrose in the solution
The molarity is equal to the moles of solute divided by the liters of solution.
[tex]M=\frac{0.102mol}{1.000L} =0.102 M[/tex]
