Homework Help: Chemistry

Posted by Emma on Thursday, December 6, 2012 at 11:18pm.

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C . The molar mass of sugar is 342.3 g/mol.

Chemistry - DrBob222, Friday, December 7, 2012 at 4:28pm
q = [mass H2O x specific heat H2O x (Tfinal-Tinitial)] + [Ccal x 4.90]
That gives q for 3.50g sucrose.
(q/3.5) x (mol mass sucrose/1 mol) = q/mol = delta Erxn

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