A heater in a hot water tank gives off 20,000 KJ per hour. The initial temperature of 450 kg of water in the tank is 8.0 degrees * C the tank is heated for 90 minutes , determine the final temperature of the water.

The final temperature of the water is 23.92°C.

Explanation:

Given that,

A heater in a hot water tank gives off 20,000 kJ per hour.  

For 1 hour or 60 minutes, heat is 20,000 kJ

For 90 minutes,

Mass, m = 450 kg or 450000 grams

Initial temperature,

We need to find the final temperature of the water. We know that the specific heat capacity of water is 4.186 J/g- °C

Heat is given by :

Hence, the final temperature of the water is 23.92°C.

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