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Author Question: Calculate the internal energy change, rU, for the combustion of 9.467 g of L-alanine (C3H7NO2, molar ... (Read 113 times)

crobinson2013

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Question 1

Calculate the internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass = 176.124 g mol-1) if the combustion inside a bomb calorimeter, Ccal = 8.31 kJ °C-1, causes a temperature change from 21.5 °C to 68.3 °C.
◦ -1.67 × 102 kJ mol-1
◦ -1.78 × 103 kJ mol-1
◦ -6.03 × 103 kJ mol-1
◦ -2.34 × 103 kJ mol-1
◦ -9.19 × 102 kJ mol-1

Question 2

Calculate the internal energy change, ΔrU, for the combustion of 9.467 g of L-alanine (C3H7NO2, molar mass = 89.094 g mol-1) if the combustion inside a bomb calorimeter, Ccal = 7.83 kJ °C-1, causes a temperature change from 24.7 °C to 46.1 °C.
◦ -3.48 × 103 kJ mol-1
◦ -1.58 × 103 kJ mol-1
◦ -8.60 × 102 kJ mol-1
◦ 6.14 × 103 kJ mol-1
◦ 3.84 × 103 kJ mol-1


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Marked as best answer by crobinson2013 on Nov 18, 2019

xMRAZ

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crobinson2013

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Reply 2 on: Nov 18, 2019
Great answer, keep it coming :)


AmberC1996

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

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