In three moles of ethane (C2H6), calculate the Number of moles of hydrogen atoms.
1 mole of C2H6 contains 6 moles of hydrogen atoms.
∴Number of moles of carbon atoms in 3 moles of C2H6
= 3 × 6 = 18
Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1and the mass per cent of nitric acid in it being 69%.
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, (ii) molar mass of the gas, and (iii) molecular formula.