Question #39c68

1 Answer
Oscar L. · anor277
Aug 22, 2016

0.50 dm3 or 0.50 L.

Explanation:

This is based on the balanced reaction:

HC≡CH(g)+2H2(g)
→H3C−CH3(g).

Thus one mole of ethyne (C2H2) requires two moles of hydrogen. Given equiv temperature and pressure for a reaction between (essentially ideal) gases, the same volume ratio applies. Thus 0.25⋅dm3 acetylene clearly requires 0.50⋅dm3 dihydrogen gas for stoichiometric equivalence.

Note that 1 dm3=(10−1 m)3=10−3 m3=1 L.

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