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Question

How many molecules of oxygen are required for complete combustion of 1 mole of acetylene (C2H2)?


A

6.022 × 1023

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B

12.044 × 1023

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C

15.055 × 1023

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D

20.11 × 1023

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Solution

The correct option is C

15.055 × 1023


Start with the balanced equation.

2C2H2+5O2 4CO2+2H2O

1 mole of C2H2 requires 52 moles of O2 for complete combustion

1 mole of O2 = 6.022 × 1023 molecules of O2

52 mole of O2 = 52 × 6.022 × 1023 molecules of O2

= 15.055 × 1023 molecules of O2


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