Answer:
moles Na = 0.1114 g / 22.9898 g/mol=0.004846
moles Tc = 0.4562g /98.9063 g/mol=0.004612
mass O = 0.8961 - ( 0.1114 + 0.4562)=03285 g
moles O = 0.3285 g/ 15.999 g/mol=0.02053
divide by the smallest
0.02053/ 0.004612 =4.45 => O
0.004846/ 0.004612 = 1.0 => Tc
to get whole numbers multiply by 2
Na2Tc2O 9
Explanation:
Hope it right hope it helps
What is the scaling factor if the molar mass of
this compound, having an empirical formula of
ch2o, is 150 g/mol?
Answer:
The scaling factor is 5.
Explanation:
Hello there!
In this case, since the scaling factor is defined as the ratio of the molar mass of the molecular formula (complete) to the empirical formula (simplified), it is possible to compute it for the empirical formula of CH2O whose molar mass is 30 g/mol (12+2+16) as shown below:
[tex]sf=150/30=5[/tex]
Therefore, we can also infer that the molecular formula would be:
[tex]C_5H_1_0O_5[/tex]
Best regards!
We measure force in units called
Which measurement occurs last when collecting data to determine the
percentage by mass of a solution?
mass percent = (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100. The formula for a solution is:
mass percent = (grams of solute / grams of solute plus solvent) x 100. or.
mass percent = (grams of solute / grams of solution) x 100. The final answer is given as %.
Hope this helps!!
5. What physical property of foam makes it a good choice to
use in life vests?
A. Foam has a relative density less than water.
B. Foam is a good thermal insulator.
C Foam is non-magnetic.
D. Foam is soluble in water.
The product(s) of a heated reaction of N,N-ethylmethylpentanamide with sodium hydroxide would be __________. View Available Hint(s) The product(s) of a heated reaction of N,N-ethylmethylpentanamide with sodium hydroxide would be __________. sodium pentanoic acid and ethylmethylamine pentanoic acid and ethylmethylamine sodium propanoate and pentylamine sodium pentanoate and ethylmethylamine
Answer:
sodium pentanoate and ethylmethylamine
Explanation:
The reaction of N,N-ethylmethylpentanamide with sodium hydroxide involves an amide and an inorganic hydroxide.
The CO-N bond is highly polar hence the -N(C2H5) (CH3) moiety is easily lost and replaced by the -ONa leading to the formation of sodium pentanoate.
The H^+ combines with -N(C2H5) (CH3) to yield ethylmethylamine
How should I write balanced net ionic equation for this reaction?
0.10 M Cu(NO3)2 + 0.010 M Cu(NO3)2
Because they're the same compound, I'm not sure how to write a net ionic equation for them. Any help is appreciated!
Answer:
Explanation:
Assumptions
They would ionize completely, or you must assume that. The volumes must be the same as well.0.11M Cu(NO3)2 ===> 0.11MCu2+ + 0.22 NO3-Note
The concentrations would merely add. All things change if the assumptions I've made are not true.
Given the following chemical reaction:
N2 + 202 --> 2 NO2
How many liters of N2 are needed to react with 10 liters of Q? Explain
Answer:
1
Explanation:
one volume of nitrogen to react
8. The density of a gas at 350 C is 0,087 g/L. Compute the density at STP.
Answer:
0.20 g/L
Explanation:
Step 1: Calculate the molar mass of the gas (M)
At T = 350 °C = 623 K and P = 1 atm (we will assume this data), the density (ρ) of the gas is 0.087 g/L. We can calculate the molar mass of the gas using the following expression.
ρ = P × M/R × T
M = ρ × R × T/P
M = 0.087 g/L × (0.0821 atm.L/mol.K) × 623 K/1 atm = 4.5 g/mol
Step 2: Calculate the density of the gas at STP
At standard temperature (T = 273.15 K) and standard pressure (P = 1 atm), the density of the gas is:
ρ = P × M/R × T
ρ = 1 atm × 4.5 g/mol /(0.0821 atm.L/mol.K) × 273.15 K = 0.20 g/L
Energy resources are required for which of the following ?
Answer: An energy resource is something that can produce heat, power life, move objects, or produce electricity
Iodine shines like metals but is not metal what is its basis
Answer:
Iodine is a non-metal, but it is lustrous (lustrous is the property of metal) in nature.
How many atoms are there in two molecules of water?
a. 3
b.4
c.5
d.6
Answer:
the answer is 4
Explanation:
your welcome lol
HELP I DON'T HAVE LONG LEFT AND I'M STRUGGLING SO BAD PLEASE I BEG U TO HELP
What is another name for a mole?
O A. Rutherford's number
O B. Mendeleev's number
O C. Dalton's number
D. Avogadro's number
Answer: D Avogadro’s Number
Explanation:
Another name for a mole is Avogadro's number. option D) is correct.
What is a Mole?
A mole refers to the amount of a substance that contains as many elementary units as can be found in 12g of Carbon-12. It can also be a number of a substance /particles, such as atoms or ions. molecules or electrons. The number of particles is approximately 6.02* 10²³ in magnitude and is called Avogadro's number of particles. it can be denoted with 'mol'.
Formula for calculating mole.
n = N/Nₐ
Where,
n = number of moles of the substance (or elementary entity)
N = total number of elementary entities in the sample
Nₐ= Avogadro constant.
Learn more about mole on
https://brainly.com/question/27918196
#SPJ1
why can't we humans live without oxygen? Can't we rely on something else? Why? Why oxygen out of all?
Answer:
because we need it to breathe
Explanation:
we breathe in oxygen and release carbon dioxide
Answer:
Ok i have a really weird theory.
Oxygen actually kills us we just don't know it yet. We need it too live but something in it also poisons us and causes us to die in around 100 years from birth. that's why we all die
real answer
we need it to breathe, when we breath we inhale in oxygen and release carbon dioxide which allows trees to grow and they produce more oxygen. We cant rely on anything else because oxygen is important and without it we die. Oxygen is one of the purist airs.
Which one is not soluble in water Licl, lioh or li3po4
Answer:
li3po4
Explanation:
Is vinegar and rubbing alcohol soluble or insoluble?
What physical property of matter determines the earth ?
Answer:
Density is a physical property that is determined by dividing the mass of a given amount of a substance by its volume.
Explanation:
Step 8: Measuring the Volume of Air Near 80°C
Use tongs to put the beaker (with tube and
thermometer) on the hot plate.
Temperature of gas: ___ C
Height of the column of gas: ___ cm
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, height of Column of gas is 7.4cm and temperature of Gas is 82°C or 355 K.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Height of Column of gas is 7.4cm and temperature of Gas is 82°Cor 355 K.
Therefore, height of Column of gas is 7.4cm and temperature of Gas is 82°C or 355 K.
To learn more about matter, here:
https://brainly.com/question/4562319
#SPJ2
Answer:
Temperature of Gas: 83C Height of the column of gas: 7.4cm
Temperature of Gas: 355K Volume of Gas: 0.93cm^3
Explanation:
This was the answer that it gave me. I hope this helps. :)))
How many grams of calcium chloride would be dissolved in 1.0L of a 0.10m solution of calcium chloride?
Answer:
2365 g
Explanation:
C3H8+3O2 = 3CO2+4H2O what is the enthalpy combustion
Answer:
[tex]\Delta H_{comb}=2043.85kJ/mol[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction, it possible for us to set up the expression for the calculation of the enthalpy change as shown below:
[tex]\Delta H_r=-\Delta H_{comb}=3\Delta _fH_{CO_2}+4\Delta _fH_{H_2O}-\Delta _fH_{C_3H_8}-3\Delta _fH_{O_2}[/tex]
Thus, given the values of the enthalpies of formation on the attached file, we obtain:[tex]-\Delta H_{comb}=3(-393.5kJ/mol)+4(-241.8kJ/mol)-(-103.85kJ/mol)-3(0kJ/mol)\\\\-\Delta H_{comb}=-2043.85kJ/mol\\\\\Delta H_{comb}=2043.85kJ/mol[/tex]
Best regards!
Today, there are ____ GMO crops currently produced in the US.
A. 120
B. 10
C. 55
D. 1000
Answer: I think that is 55
Explanation: I hope I help
3.
Why do you suppose internet service costs a lot of money?
Answer:
Why does internet cost so much? Equipment and installation: One of the main reasons for internet prices to run high is the cost of equipment and installation in new service areas. Fiber optic cables are expensive, so fiber optic internet providers may have higher prices to recoup the costs of installing new lines.Apr 21, 2021Explanation:
Is anyone good at chemistry if so can someone help me please ?
(NO LINKS)
As provided in the question, the pH of a solution is equal to the negative logarithm of the H₃O⁺ concentration in the solution (the square brackets denote the molar concentration).
We are given a solution with an H₃O⁺ concentration of 5.6 × 10⁻⁹ M. So, the pH of this solution would be:
pH = -log[H₃O⁺] = -log(5.6 × 10⁻⁹ M) = 8.25.
A pH that is equal to 7 is neutral; less than 7, acidic; and greater than 7, basic. As 8.25 is greater than 7, this solution is basic.
3.88g of NaOH is required to neutralize a spill of hydrochloric acid. A 0.516M solution of NaOH is available for use.
A. Determine the number of moles needed to complete the reaction.
B. What volume of NaOH solution is needed for this reaction?
C. What volume of a stock 1,15M solution would be used to make the solution used in the reaction?
Answer:
ftb
Explanation:
In the context of a balanced chemical equation, a____is a number to the lower right of an element or ion within formula and it applies to____. A____is a number to the left of a formula and it applies to_____. Only_____should be added or changed when balancing chemical equations.
Answer:
Explanation:
The preceding chapter introduced the use of element symbols to represent individual atoms. When atoms gain or lose electrons to yield ions, or combine with other atoms to form molecules, their symbols are modified or combined to generate chemical formulas that appropriately represent these species. Extending this symbolism to represent both the identities and the relative quantities of substances undergoing a chemical (or physical) change involves writing and balancing a chemical equation. Consider as an example the reaction between one methane molecule (CH4) and two diatomic oxygen molecules (O2) to produce one carbon dioxide molecule (CO2) and two water molecules (H2O). The chemical equation representing this process is provided in the upper half of Figure 1, with space-filling molecular models shown in the lower half of the figure.
Which of the following descriptions is correct?
А. a mixture consists of two or more pure substances which can only be separated by chemical methods
B. a colloid is a 'cloudy' mixture containing particles which will not easily settle out when the colloid is left standing
C. a solution consists of a solvent dissolved in a solute
D. a suspension contains particles which will not settle out if the suspension is left standing
What is the empirical formula of the following molecular formula: C3H6
Answer:
CH2
Explanation:
The empirical formula is the lowest ratio form of a compound. You can divide both C and H by 3 to get to CH2.
What mineral property is being tested below?
Answer:
Streak
Explanation:
Hope it Help
Thanks me later
160 mL of a 37.5 % (m/v) LiNO3 solution
Answer:
60g of LiNO3 are required
Explanation:
Calculate the amount of solute, in grams or milliliters, to prepare...
The percentage mass/volume %(m/v) is defined as the mass in grams of the solute in 100mL of solution
To solve this question we must know that in a 37.5% (m/v) of LiNO3 you have 37.5g of LiNO3 in 100mL of solution.
Thus, to prepare 160mL are required:
160mL * (37.5g / 100mL) =
60g of LiNO3 are requiredA rigid, insulated vessel is divided into two compartments connected by a valve. Initially, one compartment, occupying one-third of the total volume, contains air at 500oR, and the other is evacuated. The valve is opened and the air is allowed to fill the entire volume. Assuming the ideal gas model with variable specific heats. Determine: a. the final temperature of the air (in oR) b. the amount of specific entropy produced (in Btu/lbm oR)
Answer:
a) the final temperature of the air is 500° R
b) the amount of specific entropy produced is 0.0758 Btu/lb-°R
Explanation:
Given the data in the question;
Air at 500° R = [tex]T_i[/tex]
Using first law of thermodynamic;
δQ = dU + W
now, since the vessel is insulated, the transfer is zero, work done also is zero since there is also no external work done.
δQ = dU + W
0 = dU + 0
dU = 0
[tex]u_f[/tex] - [tex]u_i[/tex] = 0
[tex]u_f[/tex] = [tex]u_i[/tex]
hence, change in internal energy is 0
Now, since the ideal internal energy is a function of temperature, the temperature will also remain the same;
[tex]T_f = T_i[/tex]
F = 500° R
Therefore, the final temperature of the air is 500° R
b)
given that; initial volume is one-third of the total volume
V₁ = [tex]\frac{1}{3}[/tex]V₂
3V₁ = V₂
3 = V₂/V₁
Now, we take the value of gas constant R from air property table; gas constant R = 0.069 Btu/lb-R
so we calculate the entropy change;
Δs = [tex]c_v[/tex]In( [tex]\frac{T_2}{T_1}[/tex] ) + R.In( [tex]\frac{V_2}{V_1}[/tex] )
we substitute
Δs = [tex]c_v[/tex]In( [tex]\frac{500}{500}[/tex] ) + 0.069 × In( 3 )
Δs = 0 + [0.069 × In( 3 )]
Δs = 0 + [0.069 × 1.0986]
Δs = 0.0758 Btu/lb-°R
Therefore, the amount of specific entropy produced is 0.0758 Btu/lb-°R
Insulated vessels separate the environment of the outer and the inner system. The final temperature is 500 degrees R and 0.0758 Btu/lb- degree R is the entropy.
What is temperature?The temperature is the measure of the hot or the coldness of the system. The first law of the thermodynamics is used to measure the final temperature of the system:
[tex]\rm \Delta Q = \rm \Delta U + W[/tex]
The work done will be zero as the system is insulated and no external work is being done.
[tex]\begin{aligned} \rm 0 &= \rm \Delta U + 0\\\\\rm U_{f} - U_{i} &= 0\\\\\rm U_{f} &= \rm U_{i} \end{aligned}[/tex]
Hence, the change in the internal energy is zero. Thus, the final temperature will remain the same,
[tex]\rm T_{f} = \rm T_{i} = 500 ^{\circ} \rm R[/tex]
Now, as we know, the initial volume is one-third of the total volume then,
[tex]\begin{aligned} \rm V_{1} &= \rm \dfrac{1}{3} V_{2}\\\\\rm 3V_{1}&= \rm V_{2}\\\\3 &= \rm \dfrac{V_{1}}{V_{2}}\end{aligned}[/tex]
The change in entropy is calculated as:
[tex]\begin{aligned} \rm \Delta S &= \rm C_{v} ln ( \dfrac{T_{2}}{T_{1}}) + R \times ln ( \dfrac{V_{2}}{V_{1}}) \\\\&= 0 + [0.069 \times \rm ln( 3 )]\\\\& = 0.0758 \;\rm Btu/lb-^{\circ}R \end{aligned}[/tex]
Therefore, the entropy produced is 0.0758 Btu/lb- degree R.
Learn more about entropy here:
https://brainly.com/question/19538748
