Question

A compound contains 32%carbon 4% hydrogen and rest oxygen vapour density is 75 what is empirical and molecular formula

Answer 1

calculate the no of moles of each element in compound no of moles of carbon=32/12=2.66no of moles of hydrogen=4/1=4no of moles of oxygen = 64/16=4then find ratio of no of moles carbon:hydrogen:oxygen2.6:4:4=1.3:2:2=1.95:3:3therefore emperical formula is C2H3O3.

Answer 2

$32 + 4 =36$