Tne heat capacity o surroundings 2) QID: 663 A calorimeter has a heat capacity o

Question

Tne heat capacity o surroundings 2) QID: 663 A calorimeter has a heat capacity of 1.77 kJ /°C, and it contains 300 g of water. What is the heat capacity of the calorimeter and its surroundings.given that the molar heat capacity of water is 75.374 J/molC? 1.26 kJ /oC 3.03 kJ/oC 2.22 kJ/°C 0.306 kJ/°C 3) QID: 670 What is the work in joules when a gas expands from 3.10L to 6.40 L against a constant external pressure of 2.00 atm? Use 1 L-atm = 101.325 J. -313J -333 J -669 J -1290 J 4) QID: 671 What is the work in joules when a gas is changed from 7.50 L to 3.00 L against a constant external pressure of 3.00 atm? Use 1 L-atm-101.325 J. 1370J -1367 J -455 J http://my.thinkwell.com/twtest/printrandom.cfm

Explanation / Answer

Q2

Ccal = 1.77 kJ/°C = 1770 J/C

m = 300 g of water

find heat capacity ´cal + surroundings

qwater = m*C*dT, then

Cwater = m*C = 300*4.184/1000= 1.2552kJ/K

Qsurroundings= Qcal + Qwater = 1.77 + 1.2552

Qsurr =3.0252 kJ/°C

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