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Some Basic Concepts of Chemistry
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13/08/2021 12:37 pm
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What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of propane gas (C3H8) measured under the same conditions?
(a) 7 L
(b) 6 L
(c) 5 L
(d) 10 L
1 Answer
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13/08/2021 12:40 pm
Correct answer: (c) 5 L
Explanation:
Writing the equation of combustion of propane (C3H8), we get
C3H8 + 5O2 → 3CO2 + 4H2O
1vol 5vol
1L 5L
From the above equation we find that we need 5L of oxygen at NTP to completely burn 1L of propane at N.T.P. If we change the conditions for both the gases from N.T.P. to same conditions of temperature and pressure. The same results are obtained. i.e. 5 L is the correct answer.