Thermodynamics

A gas expands isothermally against a constant external pressure of 1 atm from a volume of 10dm3 to a volume of 20L . In this process it absorbs 800J of thermal energy from its surroundings . Calculate the internal energy change in the entire process in Joules.

• 200

• 213

• 400

• 826

10 moles of an ideal gas expands isothermally and reversibly from a pressure of 10 atm to 2 atm at 300K. What is the largest mass that can be lifted through a height of 1m in this expansion?

• 200kg

• 509kg

• 409kg

• 121kg

Work done in an isothermal reversible process is always ________than the work done in an isothermal irreversible process.

• higher

• lower

• less

• min

One mole of an ideal gas expands against a constant external pressure of 1 atm from a volume of 10L to 30L. Calculate the work done by the gas in Latm.

• +20

• -20

• 40

• -40

J-T effect is an________process

• isothermal

• isoentropic

• isochoric

• isoenthalpic

• 100

• 287

• 137

• 274

• -114

• 580

• 233

• -453

The rection shown in the graph is an example of

• general reaction

• endothermic reaction

• exothermic reaction

• all the above

• 289.2

• 189.2

• 389.2

• 489.2