Nane Last First Chen: 126 Section Thermodynamics Review March 20t2016 1. A gas i

Question

Nane Last First Chen: 126 Section Thermodynamics Review March 20t2016 1. A gas is compressed from 25.0 I. to 5.0 L. at 0.50 atmospheres In addition a total of 4200 3 of heat are gained froin warmer surroundings. What is the dange in internal energy in kr 1L × atm-10?? (a) 1s q positive or negative (b) Caleulate q in kJ c) Is W positive or gative (d) Caleulate W in k (e) Caleulate internal eaergyEin k 2. The combustion of 1.00 mol of liaid ethanol (CH,CH,OH) at const ant proessare in excess oy relases 50okJ of heat per mole of ethanol. What is the enthalpy change (in kJ) for burning of 100g of ethanol? pay attention to the sign! (a) Write down the reaction of combastion of ethanol b) What is the connection between heat at constant pressare and enthalpy e) Is euthalpy positive or negative? d) How many moles are in 10.0g of ethanol e) What is the enthalpy for buraing 10.0g of ethanol

Explanation / Answer

1) a)q is positive because of heat gained from surrounding

b)4.2 kj

C)work done on body so W is positive.

D)20*101 kj

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