Chemistry Homework Help

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Heating and Cooling Curves

#### Q. From the data below. calculate the total heat [in J) needed to convert 30.00 g of ice at 4.25C to liquid water at 0.350C: m.p at 1 atm: 0.0C [d]Hofus:6.02kJ/mol c liquid: 4.184 j/g C c solid:2.09 j/g C

Solved • Jun 28, 2019

Heating and Cooling Curves

#### Q. How much heat in kJ, is required to convert 36.12 grams of water at 100°C to steam? (ΔHvap = 40.657 kJ/mol.)

Solved • Jun 24, 2019

Heating and Cooling Curves

#### Q. How much heat (in kJ) is required to convert 426 g of liquid H2O at 22.9°C into steam at 145°C? (Assume the specific heat of liquid water is 4.184 J/g°C, the specific heat of steam is 2.078 J/g°C, and both values are over the given temperature ranges. The normal boiling point of H2O is 100.00°C. )

Solved • Jun 24, 2019

Heating and Cooling Curves

#### Q. Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 0.550 kg of water decreased from 123 °C to 50.0 °C.

Solved • May 20, 2019

Heating and Cooling Curves

#### Q. How many grams of ethanol C2H5OH can be boiled with 803.2 KJ of heat energy? The molar heat of vaporization of ethanol is 38.6 KJ/mol

Solved • May 12, 2019

Heating and Cooling Curves

#### Q. Calculate the heat that is required to heat a piece of 20.0 g ice at –8.0 ˚C to water at 25 ˚C.

Solved • May 8, 2019

Heating and Cooling Curves

#### Q. a 24.21g sample H2O ice initially at -20°C is heated & converted into steam at 120°C. Calculate amount of heat required ∆H°vap=40.8kJ/mol, s(H2Ol)=4.18J/g•°C, s(H20s)=2.01J/g•°C, s(H2Og)=2.05J/g•°C

Solved • May 2, 2019