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ICSE Class 10 Chemistry 2017 Paper

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Question : 60 of 86
Marks: +1, -0
Propane burns in air according to the following equation:
C3H8+5O2→3CO2+4H2O\mathrm{C}_3\mathrm{H}_8 + 5\mathrm{O}_2 \rightarrow 3\mathrm{CO}_2 + 4\mathrm{H}_2\mathrm{O}
What volume of propane is consumed on using 1000 cm31000\,\mathrm{cm}^3 of air, considering only 20%20\% of air contains oxygen?
Solution:  
C3H8+5O2→3CO2+4H2O1:5::3\begin{array}{ccccccc} \mathrm{C}_3\mathrm{H}_8 & + & 5\mathrm{O}_2 & \rightarrow & 3\mathrm{CO}_2 & + & 4\mathrm{H}_2\mathrm{O} \\ 1 & : & 5 & :: & 3 & & \end{array}
20%20\% of oxygen in 1000 cm31000\,\mathrm{cm}^3 of air =200 cm3=200\,\mathrm{cm}^3 .
5 vol. Oxygen uses for 1 vol C3H8\mathrm{C}_3\mathrm{H}_8 .
200 vol. Oxygen uses for   15×200\;\frac{1}{5} \times 200
=40 cm3=40\,\mathrm{cm}^3
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