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210 solutions

Calorimetry

Q. A 110.0 g sample of metal at 82.00*C is added to 110.0 g of H2O(l) at 27.00*C in an insulated container. The temperature rises to 30.56*C. Neglecting the heat capacity of the container, what is the specific heat of the metal? The specific heat of H2O(l) is 4.18J/(g x *C).

Solved • Nov 21, 2019

Calorimetry

Q. Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene burns in a bomb calorimeter, the temperature rises from 24.25°C to 32.33°C. Find ∆E for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11 kJ/°C.

Solved • Nov 19, 2019

Calorimetry

Q. We submerge a 32.5-g iron rod, initially at 22.7 °C, into an unknown mass of water at 63.2°C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.5 °C. What is the mass of the water?

Solved • Nov 19, 2019

Calorimetry

Q. A 1.00 g sample of n-hexane (C6H14) undergoes complete combustion with excess O2 in a bomb calorimeter. The temperature of the 1502 g of water surrounding the bomb rises from 22.64°C to 29.30°C. The heat capacity of the hardware component of the calorimeter (everything that is not water) is 4042 J/°C. What is ΔU for the combustion of n-C6H14? One mole of n-C6h14 is 86.1 g. The specific heat of water is 4.184 J/g.ΔC. a) -1.15x10^4kJ/mol b) -9.96x10^3kJ/mol c) -4.52x10^3kJ/mol d) -5.92x10^3kJ/mol

Solved • Nov 19, 2019

Calorimetry

Q. When 0.485 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.285°C is observed. What is ΔU of the reaction for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.81 kJ/°C. The specific heat of water is 4.184 J/g.°C. The molar mass of compound X is 56.0 g/mol. a) -4660 kJ/mol b) 4660 kJ/mol c) -538 kJ/mol d) 538 kJ/mol

Solved • Nov 19, 2019

Calorimetry

Q. A piece of metal with a mass of 22 g at 92°C is placed in a calorimeter containing 70.3 g of water at 21°C. The final temperature of the mixture is 25.4°C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the surroundings. a) -0.88 J g^-1°C^-1 b) -1.14 J g^-1°C^-1 c) 1.14 J g^-1°C^-1 d) I have no idea how to even start this. e) 0.88 J g^-1°C^-1

Solved • Nov 19, 2019

Calorimetry

Q. The specific heats and densities of several materials are given below: Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel. a) 84.7°C b) 37.0°C c) 1.43°C d) 1.18°C

Solved • Nov 19, 2019