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A student wanted to apply his knowledge of thermodynamics to some practical applications. He performed a number of experiments. In an experiment, he took a closed vessel in which he dissolved 28 g of iron in hydrochloric acid at 27 o C. In another experiment, he dissolved the same amount of iron but in open vessel. However, he compressed the gas evolved to 10 atm pressure at 27 o C and then again allowed to expand it isothermally and reversibly until the pressure fell down to 1 atm. In one case, he used the work obtained to lift a heavy body mass 20 kg till the pressure fell down to atmospheric pressure and in another case (on repeating the expt.), he used the work obtained to heat up 1 litre of water. a) In the first expt., calculate the work done by the system. b) In the 2nd expt., calculate work done by the system if the gas were not condensed. c) What is work done by compressed gas? d) Calculate the height through which body would be lifted. e) Calculate the rise in temperature.

A student wanted to apply his knowledge of thermodynamics to some practical applications. He performed a number of experiments. In an experiment, he took a closed vessel in which he dissolved 28 g of iron in hydrochloric acid at 27oC. In another experiment, he dissolved the same amount of iron but in open vessel. However, he compressed the gas evolved to 10 atm pressure at 27oC and then again allowed to expand it isothermally and reversibly until the pressure fell down to 1 atm. In one case, he used the work obtained to lift a heavy body mass 20 kg till the pressure fell down to atmospheric pressure and in another case (on repeating the expt.), he used the work obtained to heat up 1 litre of water.
a) In the first expt., calculate the work done by the system.
b) In the 2nd expt., calculate work done by the system if the gas were not condensed.
c) What is work done by compressed gas?
d) Calculate the height through which body would be lifted.
e) Calculate the rise in temperature.

Grade:12th pass

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