16. the temperature of the melted ice to 75°C? How many joules of heat are required to melt 15.0 kg of ice at 0°C and to raise re of the melted ice to 20°C? equired to melt 50.0 kg of ice at 0°C and to 17. How many joules of heat need to be removed from 1.25 kg of steam at 115°C to condense it to water and cool the water to 50°C? 18. How many kcal of heat are needed to vaporize 5.00 kg of water at 100 C and raise the temperature of the steam to 145°C? 19. How many calories of heat are needed to change 625 g of ice at -24.0C to steam at 132.0°C? 20. How many Btu of heat must be withdrawn from 5.65 lb of steam at 236.0°F to change it to ice at 12.0°F? How many kilocalories of heat are needed to change 143 N of ethyl alcohol at 21. 65.0°C to vapor? How many joules of heat does 620 g of mercury require to go from a solid at 22. -38.9°C to vapor? Glossary le temperature. (p. 374) to raise the tem-

Question

How many joules of heat does 620 g of mercury require to go from a solid at -38.9 degrees celcius to vapor?