Question #39c68

1 Answer
Aug 22, 2016

Answer:

#0.50" dm"^3# or #0.50 " L"#.

Explanation:

This is based on the balanced reaction:

#HC-=CH(g) +2H_2(g)#
#rarr H_3C-CH_3(g)#.

Thus one mole of ethyne (#"C"_2"H"_2#) 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*dm^3# acetylene clearly requires #0.50*dm^3# dihydrogen gas for stoichiometric equivalence.

Note that #1" dm"^3=(10^-1" m")^3 =10^-3" m"^3=1" L"#.