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Author Question: A chemist wishes to calibrate a bomb calorimeter, so he combusts 7.529 g of D-galactose, combustionU ... (Read 90 times)

james0929

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on: Nov 18, 2019

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
Chemistry: A Molecular Approach (Canadian) ¦ Tro, Fridgen, Shaw ¦ 2nd Edition
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Marked as best answer by james0929 on Nov 18, 2019

pikon

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Reply #1 on: Nov 18, 2019
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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james0929

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Reply 2 on: Nov 18, 2019
Gracias!

daiying98

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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