Question

The mass of CO2 obtained when 15g of coke is burnt in 32g of oxygen is (assume coke contains 100% Carbon)

Answer 1

Answer:

C(coke)+O2→CO2

mass of coke given 15gm

mass of oxygen given 32gm

The atomic mass of C is 12 g/mol. The molecular masses of O2 and CO2 are 32 g/mol and 44 g/mol respectively.

12 g C will combine with 32 g O2 to form 44 g CO2.

15 g C will combine with 32 g O2 to form Xg CO2

mass of CO2 formed will be 44 gm

3gm of coke will be left unused

as we need 32gm of oxygen for combustion of 12gm coke