The entropy change if one mole of water is warmed from 0 degree C to 100 degree C is 1,316.7 J/K.
How do we calculate the entropy change?Change in entropy will be measured by using the below equation as:
ΔS = (n)(Cp)ln(T₂/T₁), where
n = moles of water = 1 mol
Cp = specific heat of water = 4180 J/mol.K
T₂/T₁ = ratio of temperatures in K = 373 / 273 = 1.37 K
On putting values, we get
ΔS = (1)(4180)ln(1.37) = (4180)(0.315)
ΔS = 1,316.7 J/K
Hence required value of entropy is 1,316.7 J/K.
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How many atoms in Ga2Se3
In a reaction the ->
means
Answer:
the arrow (single arrow) means that all the reactants are going to products.
Please help asap!!!!!!!!!!!
Answer:
B
Explanation:
Where velocity doesn't change, THERE IS NO ACCEL....this is section B
sample of helium gas contains 0.22 moles of helium. How many additional moles of helium gas must be added to the sample to obtain a volume of 6.4L
The required additional moles of helium gas must be added to the sample to obtain a volume of 6.4L is 0.293 moles.
How do we calculate the required moles?Required moles of the final volume will be calculated by using the below equation as:
n₁/V₁ = n₂/V₂, where
n₁ & V₁ are the moles and volume of initial solution.
n₂ & V₂ are the moles and volume of final solution.
On putting values from the question to the equation, we get
n₂ = (0.22)(6.4) / (4.8) = 0.293 moles.
Hence required moles of helium gas is 0.293.
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How many moles of carbon dioxide are produced if 50.0 L of oxygen is used?
If a reactant is in excess, why do we not worry about the mole ratios involving that reactant?.
Answer: The limiting reactant will be used up first, meaning the reaction can no longer occur with only the excess reactant.
Explanation:
In a reaction the reactant which determines the yield of the reaction is called limiting reactant. Whereas, the reactant which is excess in amount does not itself lead the reaction after the limiting reactant is consumed.
What is excess reactant?In a reaction, the yield of the product depends on the number of moles of reactants. The reactants which is not sufficient in amount is determining the yield because as soon as this reactant is consumed, the production stopes.
The excess reactant on the other hand is excess in amount which can't lead the reaction alone after the consumption of the limiting reactant. Hence, we don't have to worry on the excess reactant.
The limiting reactant of a reaction can be determined by calculating the number of moles of each reactants participating in it.
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please help, will give brainliest
Answer:
See explanations and answers below
Explanation:
From the equation each mole calcium bromide makes 2 moles sodium bromide
1) 5 x 2 = 10 moles sodium bromide
2) 2 moles of calcium bromide will make 2 moles of calcium sulfate ( from the equation)
mole weight of calcium sulfate =
Ca = 40 S = 32 O4 = 64 total mole weight = 136 gm
two moles would weigh 272 gms
3) 845 gm of calcium sulfate is 845 gm / 136 gm/mole = 6.21 moles
6.21 moles of Ca Br2 will be needed
6 .21 ( 40 + 2 *79.9) = 1240.76 gm
The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. nacl agno3 right arrow. nano3 agcl if 4.00 g of nacl react with 10.00 g of agno3, what is the excess reactant? agcl nacl agno3 nano3
Answer:
The excess reactant is the NaCl.
Explanation:
NaCl(aq) + AgNO3 (aq) → NaNO₃(aq) + AgCl (s) ↓
This is a precipitation reaction.
We need to convert the mass of each reactant to moles:
4 g / 58.45 g/mol = 0.068 moles of NaCl
10 g / 169.87 g/mol = 0.059 moles of nitrate.
As stoichiometry is 1 by 1, 1 mol of chloride will react with 1 mol of nitrate.
If I have 0.059 moles of nitrate, I will need the same amount of chloride and I have 0.068 moles. I still have chloride, therefore the excess reactant is the NaCl.
0.068 mol - 0.059 mol = 0.009 moles are the moles of NaCl that remains after the reaction is complete
Answer:
NaCl
Explanation:
Which statement is true ? ( only one answer)
A) electrons are larger than protons
B) atoms are the smallest living organism
C) the number of protons in a atom determines the element
32
How many moles of Ca(NO) are there in a sample with a mass of 50.0 g?
a. 0.305 mol
b. 0.333 mol
c.
0.490 mol
d. 8200 mol
Answer:
0.305 mol
Explanation:
Ca(NO) is not a molecule. I think you meant to type Ca(NO3)2, which is calcium nitrate.
The moles of a compound is equal to is mass divided by its molar mass.
The molar mass of Ca(NO3)2 is 164.09 g/mol.
50.0 / 164.09 = 0.305
When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe?
exothermic
endothermic
both exothermic and endothermic
neither exothermic nor endothermic
You've found some fossil bones while digging in your backyard. Could they be dinosaur bones? Using carbon dating, you determine that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed into nitrogen-14.) How many half-life cycles has it gone through?
The half-life of Carbon-14 is 5730 years. When did the animal die?
Answer:
5 is the first answer and 28,650 for second
A gas at 200 Celsius and 10.0L expands to 20.0L. What is the new temperature in Celsius
Answer:
400celcius
Ex:
200 per 10.0L
400 per 20.0L
A device that sends electrical impulses to the heart to correct an irregular
heartbeat is called what?
O A. A pacemaker
O B. An electrical heart valve
O C. A nanotube
O D. A stent
Please help me on #2 giving BRAINLIEST!
Answer:
basic
Explanation:
because H is hydrogen
The attraction of hydrogen to oxygen in a water molecule has unequal sharing of electrons, caused by a(n) _____.
A. metallic bond
B. nonpolar covalent bond
C. covalent bond
D. ionic bond
E. polar covalent bond
Answer:
c
Explanation:
got it right on my test
Answer:
The answer is: C aka covalent bond
Explanation:
Happy to help
What is the total heat energy required to
raise the temperature of 10g of liquid water
from 20 degrees Celsius to 150
degrees Celsius?
Answer: 200 j
Explanation:
ethanol is widely used in antibacterial hand sanitizer and wipes.explain
Explanation:
Ethanol works as an antiseptic as it is capable of breaking down the cellular membrane of cells/ causes cell lysis. It also denatures protiens.
42. Balance the equation below. What is the coefficient for HCI?
Help me please don’t answer then delete I will report u
Answer:
Mg + 2HCl ⇒ MgCl₂ + H₂Coefficient of HCl = 2Explanation:
Equation (given) :
Mg + HCl ⇒ MgCl₂ + H₂Compare the LHS and RHS :
On the left side, there are only single atoms of H and Cl, whereas there are 2 of each on the right sideAs HCl is a single compound on the left, multiply HCl into 2 to balance the reactionCoefficient of HCl = 2Balanced Equation :
Mg + 2HCl ⇒ MgCl₂ + H₂What is the Mass of 1 mole of N2? Show your work
Answer:
28 g/mol
Explanation:
since the atomic weight of Nitrogen is 14 you take the amount of it and multiply it by that so in this case it would be this equation:
14 x 2 = 28
If 60. liters of hydrogen gas at 546 K is cooled to 273 K at constant pressure, the new volume of the gas will be
**I NEED ANSWERS STEP BY STEP PLEASE**
The new volume of H₂ gas at constant pressure is 30L.
What is new volume of H₂ gas at constant pressure at given conditions?Apply Charles law,
V₁/T₁=V₂/T₂
Put the given value
V₁=60L, T₁=546K T₂=273K V₂=?
Solve the equation
60/546=V2/273
V₂=30L
Hence, the new volume of H2 gas at constant pressure is 30L.
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how can coefficients be used to balnce a chemical equation?
What is the pH of a solution whose [H⁺] is 2.7 x 10⁻⁴ M?
Answer:
Here is the solution..Hope it helps:)
Select all the following solutions that would be expected ph values for basic solutions?
ph 7
ph 9
ph 12
ph 5
ph 10
Answer:
9, 10, 12
Explanation:
anything greater than pH 7 is basic
How does the author build understanding of body odor?
Explanation:
because the author create that body odor to people who read the things like story to they feel like hopeless
What is the difference between ethanol and methanol.
The elements of a group have the same number of ___________________ in their ______________ shell
Answer:
Same amoung of electrons in their outer shell
Explanation:
elements in the same group have the same number of electrons in their outer shell this is why they are in the same group
The elements of a group have the same number of valence electrons in their outermost shell.
Why do the elements of the same group have similar chemical behavior?The chemical properties of elements are described by the number of valence electrons in their outermost shell. The chemical elements placed in the same group have the same number of valence electrons in their valence shell. Therefore, the chemical elements placed in the same group of the periodic table have similar chemical behavior.
The elements having identical valence electronic configurations in their atoms are arranged in the same group of the modern periodic table. These valence electrons are accountable for the chemical properties and reactivities of the elements.
For example, the chemical properties of all elements in group 1 are similar as they have only one electron in their valence shell. The chemical elements of group 17 have seven electrons in their valence shell they are halogens with similar chemical behavior.
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salt seems to disappear when it is poured into water use the terms mixture solution and dissolve to explain what happens
Answer:
water acts as a solvent and dissolves the solute (salt) to produce a salt water solution
Explanation:
A 2.75 M solution is diluted to 0.706 M, if the starting volume was 0.833L, what is the new volume?
Answer:
3.2447
Explanation:
m1v1 = m2v2
Acids which contain only hydrogen and a single other element are referred to as.
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A binary acid is an acid that consists of hydrogen and one other element.