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Author Question: A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity of 5.65 kJ ... (Read 511 times)

yoroshambo

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Question 1

The temperature rises from 25.00 °C to 29.00 °C when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ΔrU for the combustion of sucrose in kJ mol-1 sucrose. The heat capacity of the calorimeter is 4.90 kJ °C-1. The molar mass of sugar is 342.3 g mol-1.
◦ 1.92 × 103 kJ mol-1
◦ -1.23 × 103 kJ mol-1
◦ -1.92 × 103 kJ mol-1
◦ 2.35 × 104 kJ mol-1

Question 2

A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity of 5.65 kJ °C-1. Using the information below, determine the final temperature of the calorimeter if the initial temperature is 25.0°C. The molar mass of ethanol is 46.07 g mol-1.

C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)DrU = -1235 kJ mol-1

◦ 74.2 °C
◦ 53.4 °C
◦ 28.1 °C
◦ 111 °C
◦ 85.7 °C


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Marked as best answer by yoroshambo on Nov 18, 2019

Loise Hard

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yoroshambo

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Reply 2 on: Nov 18, 2019
Thanks for the timely response, appreciate it


CAPTAINAMERICA

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

 

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