In a combustion experiment, it was found that 12.096 g of hydrogen molecules combined with 96.000 g of oxygen molecules to form water and released 1.715 * 103 kJ of heat. Calculate the corresponding mass change in this process. (1 J = 1 kg · m2/s2)

Question

Shirley

Chemistry

5 June, 06:18

In a combustion experiment, it was found that 12.096 g of hydrogen molecules combined with 96.000 g of oxygen molecules to form water and released 1.715 * 103 kJ of heat. Calculate the corresponding mass change in this process. (1 J = 1 kg · m2/s2)

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Victor Lee · Answer 1

The mass change, or the mass defect, can be calculated by the formula that is very known to be associated with Albert Einstein.

E = Δmc²

where

E is the energy gained or released during the reaction

c is the speed of light equal to 3*10⁸ m/s

Δm is the mass change

(1.715*10³ kJ) (1,000 J/1 kJ) = Δm (3*10⁸ m/s) ²

Δm = 1.91*10⁻¹¹ kg