I need help solving this problems, can you show me calculations.

How many litres of CO2 will approximately be evolved in the reaction of 18 g of

potassium hydrogen carbonate with 65 g of 10 % sulphuric acid?

A) 1, B) 2, C) 3, D) 4, E) 5.

Answer c)

What must be the minimum concentration (% by mass) of 1 kg of a potassium hydroxide

solution for a complete neutralisation of 3.57 moles of nitric acid?

A) 5 %, B) 10 %, C) 15 %, D) 20 %, E) 25 %.

Answer d)

How many litres of air are approximately required for complete combustion of 1 litre of

ammonia?

A) 1, B) 2, C) 3, D) 4, E) 5.

Answer D)