Question

calculate the no of moles in 9g of methane
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Answer 1

Answer:

is it methane or ethane

Explanation:

if it is ethane than it is o. 3mole but if it is methane then I don't know

Answer 2

Given mass of Methane (CH₄),

$\sf{\longrightarrow W=9\ g}$

Atomic mass of Carbon $\sf{=12\ g\,mol^{-1}.}$

Atomic mass of Hydrogen $\sf{=1\ g\,mol^{-1}}$

Then, gram molecular mass of Methane,

$\sf{\longrightarrow M=(12+4\times1)\ g\,mol^{-1}}$

$\sf{\longrightarrow M=16\ g\,mol^{-1}}$

We know that no. of moles,

$\sf{\longrightarrow n=\dfrac{W}{M}}$

It indicates how many gram molecules are included in the given mass of the compound.

So,

$\sf{\longrightarrow n=\dfrac{9\ g}{16\ g\,mol^{-1}}}$

$\sf{\longrightarrow\underline{\underline{n=0.5625\ mol}}}$