5gm of steam at 100c is passed into calorimeter containing liquid.Temperature at liquid rises from 32c to 40c.Then water equivalent of calorimeter and contents is

Latent heat of vaporisation of water = 2260kJ/Kg

Specific heat capacity of water = 4185.5 J/Kg

Heat lost by steam = heat gained by the water and calorimeter

Formula :

Heat gained by water = mcФ

m = mass of water

c = specific heat capacity of water.

Ф = Change in temperature.  = 40 - 32 = 8

Heat lost by steam = mLv + mcФ

Lv = latent heat of vaporisation

m = mass of steam.

Ф = 100 - 40 = 60

Doing the substitution :

2260000 × 0.005 + 60 × 0.005 × 4185.5 = m × 4185.5 × 8

12555.65 = 33484m

m = 12555.65/33484 = 0.37497 kg

= 0.37497 × 1000 = 374.97 kg

= 374.97kg