Question

Help please?

Answer 1

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Answer 2

theres 2 things you need to know for this problem

the stoichiometric ratio given by the balanced equation and the ideal gas law PV=nRT

There's several ways to approach the problem:

I would suggest you find the number of moles 12.5L of water are using the ideal gas law:

PV=nRT

then once you know that use the stoichiometric ratio

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aA + bB -> cC

lower case are coefficients and upper case are the species

so a ratio would be set up like this:

\[\frac{ moles of A }{ a}=\frac{ moles ofC }{ c }\]

you can then plug things in and solve for your unknown

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once you find the number of moles of methane you need, simply convert to mass (in g).

moles=mass/molarmass