How do you convert mass of methane to moles of water vapor?

Question

The question is: Methane, the main constituent of natural gas, is burned. How many moles of water vapor are produced from 4.00 g of methane?
The answer is 0.498mol of H20 but I don't know how to get that.
I understand how to do moles to mass but I can't seem to get it this way. Please help me.

Answer 1

First thing to do is write out the balanced chemical equation. With that in front of you, you can see how many moles of methane correspond to how many moles of water vapor. Then it's easy to convert:
grams of methane-->
moles of methane-->
moles of water vapor

Answer 2

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