# A level Chemistry question help? Burning methane...?

The question is:

Methane burns in excess oxygen to form carbon dioxide and water vapour.

a)Write a balanced symbol equation, including state symbol for this reaction

b) How does the volume of oxygen used compare with the volume of methane burned?

c) What can you say about the volume of water vapour formed compared with volume of methane burned?

I need help with parts c and d. How would I do it? Thanx

Update:

sorry, I meant I need help with part b and c...there is no part D I've completely gone nuts. Thanks to those who answered I get it!

Relevance

Balanced equation:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

b) Volume of oxygen used is twice the volume of methane burned

c) Volume of water vapour produced is twice the volume of methane burned

Look at the coefficients of the balanced equation.

• a) CH4 + 2O2 = CO2 + 2H2O (the numbers after H and O are subscripts on both sides)

gas ↗ + gas ↗ = gas ↗+ gas ↗

b) Equal volumes of all gases (at same physical conditions), contain equal number of molecules

TWO volumes of Oxygen combine with ONE volume of Methane 2O2 + 1CH4

c) Volume of water vapour produced is twice volume of methane burnt. 1CH4 +...= 2H2O + ....

• CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(g)

The volume of oxygen is twice that of methane

The volume of water formed is twice that of methane

I don't see a part d