5. Formula and amounts (VOLUME)

Question 1

Give the equation to work out volume from standard or room temperature and pressure

Answer 1

Volume (dm3) = moles x either 24 or 22.4 ( molar gas volume)

Question 2

What is the molar gas volume

Answer 2

volume occupied by one mole of a gas at a specified temperature and pressure

–> eg room temperature and pressure (rpt) or standard temperature and pressure (stp)

Question 3

Why do we use the ideal gas equation

Answer 3

To work out the number of moles in a certain volume at any temperature or pressure

Question 4

Give the ideal gas equation

Answer 4

pV = nRT

Question 5

Give the units for each part of the ideal gas equation

Answer 5

Pressure - Pascals
Volume - m3
number of moles - ( often need to do mass/mr)
Gas constant - 8.31 (given in data booklet)
Temperature - Kelvin

Question 6

How to convert from celsius to kelvin

Answer 6

+ 273

Question 7

How to convert from tonnes to grams

Answer 7

X by one million (x10^6)

Question 8

What does 1 atm (atmosphere) equal in Pascal

Answer 8

1 atm = 101325 Pa

Question 9

What does 1 bar equal in pascals

Answer 9

100k Pa (100,000Pa)

Question 10

What must you remember to do after calculating the volume using the ideal gas equation

Answer 10

X by 1000 to get to dm 3 (the answer comes out in m3)