Question

calculate the amount of CO2 formed when 32gm of ethane (c2h4) is burnt in 80 gm of oxygen supply

1. also calculate moles of excess reagent left
2. also calculate moles of H2O formed
​

Answer 1

Explanation:

Molar mass of ethene C

2

H

4

=2(12)+4(1)=28 g/mol

7.0 g ethene corresponds to

28g/mol

7.0g

=0.25 moles

1 mole of ethene gives 2 moles of CO

2

.

0.25 moles of ethene will give 0.50 moles of CO

2

.

Molar mass of CO

2

is 44 g/mol.

Mass of CO

2

will be 44 g/mol × 0.50 mol= 22 g

Hence, option B is correct.