Question
Calculate the amount (mass) of acetaldehyde (C2H40, molar mass - 44.0526 g moll) that causes a...

Calculate the amount (mass) of acetaldehyde (C2H40, molar mass - 44.0526 g moll) that causes a bomb calorimeter with a heat capacity of 12.91 kJ °C to have a temperature increase from 27.8 °C to 41.7°C. The AU for the combustion of acetaldehyde is -1166.9 kJ mol? 7.30 g 6.778 5.55g 8.67 g 4.29 g
Answers
HEAT PRODUCED=12.91
(41.7-27.8)=179.449KJ
GIVEN HEAT PRODUCED AFTER COMBUSTION=1166.9KJ/mol
so number of moles of acetaldehyde is=1166.9
179.44=6.5 mol
mass ofacetaldehyde=6.5
44.05= 286.3419 ganswer
IF WE 44.05
6.5=6.77g THIS is INCORRECT ANSWER.
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