DF8 - Gas calculations (burning fuels)

Question 1

What is produced is complete combustion of

carbon-based fuels?

Answer 1

CO2 and water

Question 2

What other product is made other than CO2 and water in incomplete combustion?

Answer 2

Carbon monoxide (CO)

Question 3

How many cm^3 in 1dm^3?

Answer 3

1dm^3 = 1000cm^3

Question 4

Is the number of molecules in one mole of gas always the same? What is it always equal to?

Answer 4

Yes

It is always equal to Avogadro’s constant

Question 5

What is the value of Avogadro’s constant?

Answer 5

6.02 x 10^23

Question 6

Define what ‘molar volume’ means

Answer 6

The volume occupied by one mole of any gas at a particular temp. + pressure

Question 7

What is the molar volume of gas at standard temp. and pressure?

Answer 7

22.4dm^3

Question 8

Describe what is meant by standard temperature and pressure (s.t.p)

Answer 8

Temperature: 0 degrees (273K)
Pressure: 1 atmosphere (101.3kPa)

Question 9

What is the molar volume of gas at room temp. and pressure?

Answer 9

24dm^3

Question 10

Describe what is meant by room temperature and pressure

Answer 10

Temperature: 25 degrees (298K)
Pressure: 1 atmosphere (101.3kPa)

Question 11

How do you work out the number of moles with a molar volume at RTP?

Answer 11

volume (dm^3) / 24 (dm^3)

Question 12

Give the ideal gas equation and give the units used

Answer 12

pV = nRT
p = pressure (Pa)
V = volume (m^3)
n = number of moles
R = gas constant (on the data sheet)
T = temperature (K)