Chemistry

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.

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  1. 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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  2. 2.35 x 104 kj/mol

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  3. 1960 j

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