Question

2. Liquid ammonia (boiling point = -33.14

Answer 1

(1) Liquid ammonia is heated from -65.0 ⁰C to -33.14 ⁰C.

Calculate the quantity of heat, q₁ required by the expression

Here, w is the mass of ammonia, S(l) is the specific heat of liquid ammonia and is the temperature difference. Substitute values in the above expression.

(2) Liquid ammonia is converted into ammonia gas (vaporization).

Calculate the quantity of heat, q₂ required by the expression

Here, n is the number of moles of ammonia and is the heat of vaporization.

Substitute values in the above expression.

(3) Liquid ammonia is heated from -33.14 ⁰C to -12.0 ⁰C.

Calculate the quantity of heat, q₃ required by the expression

Here, w is the mass of ammonia, S(g) is the specific heat of ammonia gas and is the temperature difference. Substitute values in the above expression.

Now calculate the quantity of heat, q required for the overall process.

Hence, of heat is required in the overall process.