Question

how much heat is needed to bring 20g of water from 30 degree C to boiling point?(specific heat capacity of water =4200jkg-10c-1)

Answer 1

Question#21877

how much heat is needed to bring 20g of water from 30 degree C to boiling point?(specific heat capacity of water =4200jkg-10c-1)

Solution:

The heat quantity needed to bring water is:

$Q = m\alpha (T_{2} - T_{1})$ , were: $m$ is the mass of water, $\alpha$ is the heat capacity of water

$$m = 20g = 0.02\,kg$$ $$T_{2} = 100{}^{\circ} \mathrm{C}$$ $$T_{1} = 30{}^{\circ} \mathrm{C}$$ $$Q = 0.02 * 4200 * (100 - 30) = 5880\,J$$

Answer: 5880 J.