Please answer all A sample of benzene weighing 3.51 g was burned in an excess of

Question

Please answer all A sample of benzene weighing 3.51 g was burned in an excess of oxygen in a bomb calorimeter. The temperature rose from 25.00 degree C to 37.18 degree C. If the heat capacity of the calorimeter and contents was 12.05 kJ/degree C, what is the value of delta H for burning 1 mol of benzene at these conditions -6.60 kJ -3.26 times -5.82 1.23 Of the following which system shows a decrease in entropy 1 2 3 4 For the reaction What is the value for delta G degree? Is the reaction spontaneous at this temperature? 7.36kJ/mol and is not spontaneous 7.36kJ/mol and is spontaneous -1.28kJ/mol and is not spontaneous -1.28 kJ/mol and is spontaneous What is the value of K given that delta G degree =233kJ/mol at 1500 degree C 1.4 times 10^-7 3.2 times 10^-4 2.1 times 10^-6 5.9 times 10^-11

Explanation / Answer

Q30

m = 3.51 g of B

dT = 37.18-25 = 12.18

C = 12.05 kJ/C

find dHrxn for 1 mol...

so

mol = mass/MW = 3.51/78.11 = 0.0449366 mol

Q = C*dT = 12.05*12.18 = 146.769 kJ

so

HRxn = -Q/n = -146.769/0.0449366 = -3266.1349 kJ/mol

HRxn = -3.26*10^3 kJ/mol

choose B

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