Question

When 20cm3 of a gaseous hydrocarbon were completely burnt in an excess of oxygen, 60cm3 of carbon dioxide and 40cm3 of water vapours were formed, all volumes being measured at same temperature and pressure. What is the formula of the hydrocarbon? А. С2H6 В. С3Н4 C. C3H6 D. С3Н8 E. C4H10

Answer 1

Answer:

20 +40cm =60cm and 60Xmas per CM = 180+60=Ans-240cm

Answer 2

Answer:

C3H4

Explanation:

ratio

20/20 = 1 of hydrocarbon

60/20 = 3 of CO2

40/20 = 2 of H2O

CxHy + O2 -----> 3CO2 + 2H2O

3 CO2 => C = 3

2 H2O => H = 2×2 = 4

C3H4 + 4O2 -----> 3CO2 + 2H2O