How many liters of hydrogen gas I needed to react with CS2 to produce 2.5 L of CH4 At STP

9.8 L

Explanation:

The reaction that takes place is:

At STP, 1 mol of any gas occupies 22.4 L.

We calculate how many moles are there in 2.5 L of CH₄ at STP:

Then we convert CH₄ moles into H₂ moles, using the stoichiometric coefficients of the reaction:

Finally we calculate the volume that 0.44 moles of H₂ would occupy at STP:

the first point, i am pretty sure.

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