Mole ConceptHard
Question
1 volume of gaseous compound consisting C, H, O on complete combustion in presence of 2.5 volume of O2 gives 2 vol. of steam and 2 vol. of CO2, what is the formula of the compound if all measurements are made at NTP ?
Options
A.C2H4O
B.CH3O
C.C2H2O
D.C2H3O2
Solution
CxHyOz + 
O2 → xCO2(g) + 
H2O(g)
x +
= 2.5
x = 2,
= 2 ⇒ y = 4
2 + 1 -
= 2.5 ⇒ z = 1
C2H4O
O2 → xCO2(g) + H2O(g)x +
= 2.5x = 2,
= 2 ⇒ y = 42 + 1 -
= 2.5 ⇒ z = 1C2H4O
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