Gas Calculations

Question 1

What is avagadros law?

Answer 1

Equal volumes of gases under the same conditions of temperature and pressure contain the same number of particles

Question 2

What are the units for pV=nRt

Answer 2

P= Pa, pascals
V= meters cubed (1,000,000 cm cubed)
n= number of moles
R= 8.314
t= temperature in K (+273°)

Question 3

Which equation do you use for a know mass of a know substance to find it’s volume of gas produced

Answer 3

Mass=Mr x Mols

Question 4

For reactions at RTP how do you find the volume of gas?

Answer 4

1. Write a balanced equation
2. Calculate moles of known substance
3. Ratio
4. Convert from moles to volume (1mol=24dm cubed)

Question 5

If it’s an equation involving gases only in the same conditions, what do you do

Answer 5

Equal volumes of gases are equal moles (if T and P are the same) so use a ratio to find the volumes