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A piece of zinc of mass 5.0 g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done by the system as a result of the reaction. The atmospheric pressure is 1.1 atm and the temperature 23°e.

The constant-pressure heat capacity of a sample of a perfect gas was found to vary with temperature according to the expression Cp/ (J K-1) = 20.17 + 0.4001(T/K). Calculate q, w, ∆U, and ∆H when the temperature is raised from 25°C to 100°C

(a) At constant pressure,

(b) At constant volume.

(a) At constant pressure,

(b) At constant volume.

Calculate the final temperature of a sample of carbon dioxide of mass 16.0 g that is expanded reversibly and adiabatically from 500 dm3 at 298.15 K to 2.00 dm3.

A sample of nitrogen of mass 3.12g at 23.0°C is allowed to expand reversibly and adiabatically from 400 cm3 to 2.00 dm3, what is the work done by the gas?

Calculate the final pressure of a sample of water vapour that expands reversibly and adiabatically from 87.3 Torr and 500 dm3 to a final volume of 3.0 dm3. Take Y = 1.3

When 178J of energy is supplied as heat to 1.9 mol of gas molecules, the temperature of the sample increases by 1.78 K. Calculate the molar heat capacities at constant volume and constant pressure of the gas.

When 2.0 mol CO2 is heated at a constant pressure of 1.25 atm, its temperature increases from 250 K to 277 K. Given that the molar heat capacity of CO2 at constant pressure is 37.11 J K-1 mol-1, calculate q, ∆H, and ∆U.

A sample of 5.0 mol CO2 is originally confined in 15 dm ' at 280 K and then undergoes adiabatic expansion against a constant pressure of 78.5 kPa until the volume has increased by a factor of 4.0. Calculate q, w, ∆T, ∆U, and MI.

(The final pressure of the gas is not necessarily 78.5 kPa.)

(The final pressure of the gas is not necessarily 78.5 kPa.)

A sample consisting of 1.5 mol of perfect gas molecules with Cpm = 20.8) K-1 mol-1 is initially at 230 kPa and 315 K. It undergoes reversible adiabatic expansion until its pressure reaches 170 kPa. Calculate the final volume and temperature and the work done

A certain liquid has ∆vapHo=32.0 k] mol-1. Calculate q, w, ∆H, and ∆U when 0.75 mol is vaporized at 260 K and 765 Torr.

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