How much heat is necessary to increase temperature of 4 kg water from 20 degree Celsius to 80 degree Celsius?

2.4 × 10⁵ cal

Explanation:

Step 1: Given data

Step 2: Convert the mass to grams

We will use the relationship 1 kg = 1,000 g.

Step 3: Calculate the change in the temperature

Step 4: Calculate the heat required (Q)

We will use the following expression.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg