[وعد..]

كيف يطلع دا الشي ؟؟
Naphthalene, contains only carbon and hydrogen. Combustion of a 1.000 g sample of
naphthalene gives 0.562 g of water H2O. What is the mass percent of hydrogen in 1.000 g
naphthalene?
a- 6.24% b- 93.7% c- 0.0624 d- 0.078