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Q.

Heat of combustion of diborane is 1976 kJ/mole. Which of the following is correct if 19.76 kJ of energy is released during reaction

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a

0.3 moles of oxygen is consumed

b

0.54 gm of water is formed

c

0.1 mole of B2O3 is formed

d

0.05 mole of diborane is burnt

answer is B.

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Detailed Solution

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B2H6 + 3O2 B2O3 + 3H2O;Hc = - 1976 kJ/mole

mass of water formed = 3×18×19.761976 = 0.54 gm

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