Question

Calculate moles present in 120 Ethane

Answer 1

chemical formula of Ethane = $C_2H_6$

so, molar mass of Ethane = 2 × atomic mass of C + 6 × atomic mass of H

= 2 × 12g/mol + 6 × 1g/mol

= 24g/mol + 6g/mol

= 30 g/mol

given, mass of Ethane = 120g

using formula,

mole = given mass/molar mass

= 120g/30g/mol

= 4mol

hence, 4mol present in 120g of Ethane.