What is the maximum mass of H_(2)O (in gm) which can be obtained if total 42 gm of propyne and oxygen are subjected to combustion?

What is the maximum mass of H_(2)O (in gm) which can be obtained if to

1.	What is the maximum mass of H_(2)O (in gm) which can be obtained if total 42 gm of propyne and oxygen are subjected to combustion?
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