LAB 5

Question 1

What are the three relationship s between T,P,V, and n

Answer 1

• Boyles
• Charles
• Avogadros

*these laws express the effect of one another when the other two are held constant *

Question 2

R has the same value

Answer 2

for all gases

Question 3

How can the ideal gas law be re-written as a general gas equation

Answer 3

P1V1/n1T1=P2V2/n2T2

Question 4

One application of the ideal gas law

Answer 4

investigate the molar volume of a gas

Question 5

Molar volume

Answer 5

the volume occupied by one mole of a gas at STP

Question 6

at the same temperature and pressure

Answer 6

equal volumes of all gases contain the same number of molecules=avogadros law

Question 7

What will be done in this lab

Answer 7

determine the volume of a known quantity of gas at a known temperature and pressure to determine the volume at STP of one mole of gas

Question 8

what elements will we be determining the molar mass of

Answer 8

H2
O2

Question 9

How is hydrogen gas produced

Answer 9

mg metal with excess of hcl (aq)

Question 10

how is oxygen gas produced

Answer 10

decomposition reaction of h2o2 in an aqueous solution

*spontaneous, but slow so we can add yeast because it contains enzyme catalase (which is a catalyst)

Question 11

change in pressure between initial and final conditions

Answer 11

will help calculate the volume occupied by one mole of gas at STP (273.15K and 1 atm)

Question 12

STP volume for an ideal gas

Answer 12

22.414L

Question 13

Daltons Law of partial pressure

Answer 13

pressure of a mixture of gases Is the sum of the partial pressure of component gases

Question 14

what do the reactions of H2 and O2 take over

Answer 14

an aqueous or water medium, therefore the reaction vessel contains pressure contained by water vapour

Question 15

how can we assure a proper reading of gas pressure for the dry gas component

Answer 15

partial pressure due to water vapour component must be accounted for using Daltons Law

Ptotal=PH2O+Pgas

Question 16

another application of the ideal gas law

Answer 16

measure density of a gas, we can do this by using the
molar volume of an ideal gas at STP
d=molar mass/molar volume

Question 17

density is

Answer 17

directly proportional to molar mass, therefore there will be an increase in density with increasing molar mass when comparing it to the standard density of H2 and O2

Question 18

how do you measure H2O2

Answer 18

using a syringe

Question 19

PV=nRT

Answer 19

P=pressure
V=volume
n=mol
R=universal gas constant (0.082058 atm(L)(mol-1)(K-1))
T=temperature