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286 solutions

Calorimetry

Q. Exposure to high doses of microwaves can cause tissue damage. Estimate how many photons, with λ = 13 cm, must be absorbed to raise the temperature of your eye by 3.0 °C. Assume the mass an eye is 11 g and its specific heat capacity is 4.0 J/g•K.

Solved • Apr 1, 2020

Calorimetry

Q. Tungsten carbide has a specific heat 0.203 J/g˚C. A sword made of pure tungsten carbide is heated to 120.0˚C then placed into 6.50 L of water. The temperature of the water rises from 38.5 ˚C to 42.3 ˚C. The specific heat of water is 4.184 J/g˚C and the density of water is 1.008 g/mL. How much energy does water absorb from the sword? Express your answer in kJ. Determine the mass of the sword in kg.

Solved • Apr 1, 2020

Calorimetry

Q. A total of 2.00 mol m o l of a compound is allowed to react with water in a foam coffee cup and the reaction produces 195 g g of solution. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 ∘C ∘ C . What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water

Solved • Mar 31, 2020

Calorimetry

Q. The balloon was in a room with a volume of 62 L. If no thermal energy escaped the room and the temperature of air in the room increased by 1.0 ˚C, what is the Specific heat capacity of the air in the room? (Air has a density of 0.0012041 g/mL) -attached is the original question with more info

Solved • Mar 31, 2020

Calorimetry

Q. In the following experiment, a coffee-cup calorimeter containing 100 mL m L of H2O H 2 O is used. The initial temperature of the calorimeter is 23.0 ∘C ∘ C . If 3.70 g g of CaCl2 C a C l 2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution ΔHsoln Δ H s o l n of CaCl2 C a C l 2 is −82.8 kJ/mol − 82.8 k J / m o l . Assume that the specific heat of the solution formed in the calorimeter is the same as that for pure water:

Solved • Mar 31, 2020

Calorimetry

Q. Zinc has a specific heat 0.387 J/g˚C. 50.0 grams of heated zinc are placed into 0.180 L of water. The initial temperature of the zinc was 100.0 ˚C. The specific heat of water is 4.184 J/g˚C and the density of water is 1.008 g/mL. During the course of this experiment, the sample of water gains 207.44 calories of energy. a)What is the final temperature at the end of the experiment and temperature of water before zinc was added?

Solved • Mar 31, 2020

Calorimetry

Q. The heat capacity of a bomb calorimeter is found to be 5.68 kJ °C^-1. When a 1.652 g sample of glucose, C6H12O6 is burned in the calorimeter, the temperature of the calorimeter increases from 24.56 °C to 29.10 °C. Calculate the H for the combustion reaction: C6H12O6(s) + 6O2(g) => 6CO2(g) + 6H2O(g) A. -2.81 x 20^3 kJ B. -25.8 kJ C. 15.6 kJ D. -42.6 kJ E. 25.8 kJ

Solved • Mar 30, 2020