1.34 A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate
(i) empirical formula
The amount of carbon in of :
The amount of hydrogen in of :
The compound contains only C and H,
Therefore, the total mass of the compound will be:
Now, the percentage of Carbon in the compound:
and the percentage of Hydrogen in the compound:
Now, the empirical formula,
Moles of carbon in the compound:
Moles of hydrogen in the compound:
So, the simplest molar ratio will be
Therefore, the empirical formula is .