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Calorimetry

Q. A given calorimeter has a heat capacity of 1550 J°C-1. When a certain mass of a metal was burned in the calorimeter that contained 150 g of water an increase in temperature of 1.211 °C was observed. The heat given off by burning the metal is 320 kJ mol-1. The metal forms a carbonate that has 14.23% carbon and 56.93% oxygen. The specific heat of water is 4.184 J g-1°C-1. Find the mass of the metal burned in the calorimeter.

Solved • Apr 4, 2020

Calorimetry

Q. Imagine that your water heater has broken, but you want to take a bath. You fill your bathtub with 25 kg k g of room-temperature water (about 25 ∘C ∘ C ). You figure that you can boil water to 100 ∘C ∘ C on the stove and pour it into the bath to raise the temperature. How much boiling water would you need to raise the bath to body temperature (about 37 ∘C ∘ C )? Assume that no heat is transferred to the surrounding environment.

Solved • Apr 2, 2020

Calorimetry

Q. A volume of 75.0 mL m L of H2O H 2 O is initially at room temperature (22.00 ∘C ∘ C ). A chilled steel rod at 2.00 ∘C ∘ C is placed in the water. If the final temperature of the system is 21.00 ∘C ∘ C , what is the mass of the steel bar? Use the following values: specific heat of water = 4.18 J/(g⋅∘C) J / ( g ⋅ ∘ C ) specific heat of steel = 0.452 J/(g⋅∘C)

Solved • Apr 2, 2020

Calorimetry

Q. Calculate the enthalpy change, ΔH Δ H , for the process in which 17.3 g g of water is converted from liquid at 12.9 ∘C ∘ C to vapor at 25.0 ∘C ∘ C . For water, ΔHvap Δ H v a p = 44.0 kJ/mol k J / m o l at 25.0 ∘C ∘ C and Cs C s = 4.18 J/(g⋅∘C) J / ( g ⋅ ∘ C ) for H2O(l) H 2 O ( l ) .

Solved • Apr 2, 2020

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