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229 solutions

Calorimetry

Q. When 100.0 g of water at 25.0 °C is heated to 37.0 °C, what is the total amount of heat absorbed? Specific heat of water = 4.184 J/g•°C.

Solved • Dec 10, 2019

Calorimetry

Q. A 32.5 g of aluminum initially at 45.8 ˚C is submerged into 105.3 g of water at 15.4 ˚C. What is the final temperature of both substances at thermal equilibrium? (Assume that the aluminum and the water are thermally isolated from everything else). (NOTE: The specific heat for water is 4.184 J.g-1 ˚C-1 and that of aluminum (Al) is 0.903 J.g-1 ˚C-1 )

Solved • Dec 10, 2019

Calorimetry

Q. In a coffee-cup calorimeter, 150.0 mL of 0.50 M HCl is added to 50.0 mL of 1.00 M NaOH to make 200.0 g solution at an initial temperature of 48.28C. If the enthalpy of neutralization for the reaction between a strong acid and a strong base is 256 kJ/mol, calculate the final temperature of the calorimeter contents. Assume the specific heat capacity of the solution is 4.184 J/°C g and assume no heat loss to the surroundings.

Solved • Dec 9, 2019

Calorimetry

Q. A 14.2 mg sample of lactic acid (C3H6O3) is burned in a bomb calorimeter whose heat capacity has been predetermined to be 4.812 kJ/ºC. The temperature increases from 23.10ºC to 24.95ºC. Calculate the heat of combustion per mole of lactic acid. A. -1.37 x 103kJ/mol B. -15.2 kJ/mol C. -1.24 x 102kJ/mol D. -5.65 x 104kJ/mol E. -8.90 kJ/mol

Solved • Dec 5, 2019

Calorimetry

Q. A 50.0 g sample of water is at 25.0 °C is mixed with 29.0 g of water at 45.0 °C. What is the final temperature of the water in °C? (the Csp of water is 4.18 J/g°C)

Solved • Dec 3, 2019

Calorimetry

Q. A 4.28x1023 atom sample of indium liquid at its freezing point is allowed to solidify. The heat lost in the process is completely transferred to a 0.316 mole sample of toluene vapor at a pressure of 98.60 kPa, a volume of 1.37 L, and a temperature of 113°0C. After the addition of the heat, the pressure of the toluene vapor becomes 16.12 psi. If nitrogen monoxide has an effusion rate that is 1.75 times greater than that of toluene, what is the final volume of the toluene vapor after the addition of the heat energy?

Solved • Dec 3, 2019

Calorimetry

Q. How many grams of aluminum fluoride must cool from 72.5C to 12.8C in order to provide enough heat energy to melt 8.44*10^22 atoms of iron at its melting point?

Solved • Dec 2, 2019