A 1.04 g sample of sucrose (CzHzzou) is combusted in a bomb calorimeter that has

Question

A 1.04 g sample of sucrose (CzHzzou) is combusted in a bomb calorimeter that has a heat capacity 3.82 kJ/oC. If the temperature increase is 4.49 °C, how much heat would be produced per mol of sucrose? a) 16.5 kJ/mol b) 17.2 kJ/mol c) 280. /mol e) 5.65 x 103 k/mol A hot tub containing 700. L of water at a temperature of 44oC was too hot to use. If there is no time to wait for the water to cool off, how many liters of 10. C water need to be added to lower the temperature in the hot tub to 40. C? a)17 L b)159 L c) 47 L d)93 L e) 187 L

Explanation / Answer

Q1.

m = 1.04 g of sucrose is combusted

C = 3.82 kJ/°C

d T= 4.49°C

find Heat from sucrose.. per mol

so..

Qcal = n*HRxn

HRxn = Qcal/n

Qcal = Ccal*dT = 3.82 * 4.49 = 17.1518 kJ

mol of sucrose = mass/MW = 1.04/342.2965 = 0.00303830 moles

so

HRxn = Q/n = 17.1518 / (0.00303830) = 5645.19 kJ/mol = 5.65*10^3 kJ/mol

best answer is E

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