A chemist wishes to calibrate a bomb calorimeter, so he combusts ...

[james0929]

Question 1

Calculate the internal energy change, ΔrU, for the combustion of 6.9261 g of diethylene glycol (C4H10O3, molar mass = 106.120 g mol-1) if the combustion inside a bomb calorimeter, Ccal = 13.84 kJ °C-1, causes a temperature change from 22.8 °C to 34.0 °C.
◦ -9.16 × 102 kJ mol-1
◦ -4.39 × 103 kJ mol-1
◦ 4.39 × 103 kJ mol-1
◦ -2.37 × 103 kJ mol-1
◦ 1.18 × 103 kJ mol-1

Question 2

A chemist wishes to calibrate a bomb calorimeter, so he combusts 7.529 g of D-galactose, ΔcombustionU = -15.48 kJ g-1, which causes a temperature change from 26.38 °C to 34.60 °C. What should the chemist report for the value of Ccal?
◦ 16.67 kJ °C-1
◦ 24.34 kJ °C-1
◦ 14.18 kJ °C-1
◦ 9.170 kJ °C-1
◦ 8.009 kJ °C-1

[pikon]

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[james0929]

Thanks for the timely response, appreciate it

[komodo7]

Excellent