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How much energy is required to change a 20 g ice cube ice at -40 ° C to steam at 100 ° C?

How much energy is required to change a 20 g ice cube ice at -40 ° C to steam at 100 ° C?

There are four specific energy to be added to obtain the total energy. 1. The heat required for water (ice) from-40C to 0 ° C 2. The latent heat of fusion to change the water from a solid to a liquid at 0 ° C (no temperature change only a single phase change) 3. The heat required for water from 0 C to 100 º C 4. The latent heat of vaporization to change liquid water to form gas (vapor) at 100 ° C (no temperature change, phase change only) These four numbers must be calculated on the basis of a mass of 20 grams. For water the latent heat fusion is 334 kJ / kg and the latent heat of evaporation is: 2260 kJ / kg just to heat water in its solid or liquid is 4.18 kJ / kg C The mass is 0.02 kg 1) 4.18 kJ / kg * 0.02 * 40C = 3.34 kJ kgC 2) 334 kJ / kg * 0.02 = 6.68 kJ kg 3) 4.18 kJ / kgC 0.02kg * * = 8.36 kJ 100C 4) 2260 kJ / kg * 0.02 = 45.2 kJ kg Add 'em all.

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