Chemistry Homework Help

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Heating and Cooling Curves

#### Q. How many 20.0-g ice cubes are required to absorb 67.1 kJ from a glass of water upon melting?

Solved • Apr 1, 2020

Heating and Cooling Curves

#### Q. How much heat is required to vaporize 35.5g of acetone (C3H6O) (C3H6O) at 25 ∘C ? The heat of vaporization for acetone at this temperature is 31.0 kJ/mol.

Solved • Apr 1, 2020

Heating and Cooling Curves

#### Q. How much ice in grams would have to melt to lower the temperature of 348 mL of water from 45 ∘C to 0∘C ? (Assume that the density of water is 1.0 g/mL.)

Solved • Mar 30, 2020

Heating and Cooling Curves

#### Q. Ice actually has negative caloric content. How much energy, in each of the following units, does your body lose from eating (and therefore melting) 77g of ice? Heat of fusion for water is 6.02 kJ/mol. Express your answer in joules. Express your answer in kilojoules.

Solved • Mar 30, 2020

Heating and Cooling Curves

#### Q. A flask containing a mixture of NH3(g) and CH4(g) is cooled. At -33.3 ∘C a liquid begins to form in the flask. What is the liquid?

Solved • Mar 30, 2020

Heating and Cooling Curves

#### Q. How much heat is required to vaporize 24.8g of water at 100 C? (ΔHvap(H2O)=40.7kJ/mol, Heat capacity( H2O)=4.184J/g ∘C). Express your answer with the appropriate units.

Solved • Mar 30, 2020

Heating and Cooling Curves

#### Q. If 5.0 kJ of energy is added to a 15.5-g sample of water at 10. °C, the water is A. still a liquid B. completely vaporized C. boiling D. frozen solid E. decomposed

Solved • Mar 23, 2020