A sample of gas contains 0.1100 mol of C2H4(g) and 0.1100 mol of H2(g) and occupies a volume of 10.1 L.

Question

The following reaction takes place: C2H4(g) + H2(g)C2H6(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.

Answer 1

C2H4(g) + H2(g) ==> C2H6(g) ... balanced equation

0.1100 mol C2H4 will react with 0.1100 mol H2 to produce 0.1100 mol C2H6 according to the balanced equation.

At constant temperature and pressure, we can use Avogadro's Law: V1/n1 = V2/n2

V1 = 10.1 L

n1 = 0.11 mol + 0.11 mol = 0.22 mol

V2 = ?

n2 = 0.11 mol

10.1 L/0.22 mol = x L/0.11

x = 5.05 L