ThermochemistryHard
Question
The most exothermic ‘ordinary’ chemical reaction for a given mass of reactants is 2H(g) → H2(g), where ΔE = 103 kcal. The theoretical decrease in mass on combination of 2.0 moles of hydrogen atoms to form 1.0 mole of hydrogen molecules, assuming that the energy is released only due to decrease in mass of the system is
Options
A.4.8 × 10–12 kg
B.4.8 × 10–12 g
C.2.4 × 10–12 kg
D.9.6 × 10–12 kg
Solution
$\Delta m = \frac{E}{C^{2}} = \frac{103 \times 10^{3} \times 4.2}{\left( 3 \times 10^{8} \right)^{2}} = 4.8 \times 10^{- 12}\text{ kg}$
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