Question

Indigenous peoples sometimes cooked in watertight baskets by placing enough hot rocks into the water to bring it to a boil. What mass (in kg) of 500°C rock must be placed in 3.50 kg of 21.0°C water to bring its temperature to 100°C, if 0.0550 kg of water escapes as vapor from the initial sizzle? You may neglect the effects of the surroundings and take the average specific heat of the rocks to be that of granite.

  kg

Please explain thoroughly and why, I am so confused.

Answer 1