Solve the following numerical problem.

Ethane burns in oxygen according to the chemical equation:

2C₂H₆ + 7O₂ ⟶ 4CO₂ + 6H₂O

If 80 ml of ethane is burnt in 300 ml of oxygen, find the composition of the resultant gaseous mixture when measured at room temperature.

The following questions are pertaining to the laboratory preparation of Ammonia gas from Magnesium nitride:

(a) Write a balanced chemical equation for its preparation.

(b) Why is this method seldom used?

(c) How do you identify the gas formed?

Draw the electron dot structure for the following:

(a) Ammonium ion

(b) A molecule of nitrogen

[At. No.: N=7, H=1]

Give a balanced chemical equation for the following conversions with conditions:

(a) Ethene from ethanol

(b) Ethyne from calcium carbide

(c) Monochloromethane from methane