Question

there is HC (hydrocarbon) on complete combustion gives 2.64 g CO2 and 0.54 g of H2O find out molecule of HC if the mass of 10 litre gas at ntp = 34.8 g

Answer 1

Number of Moles=Mass(g)/Molar Mass
2.64/44.0=0.06 moles of CO2
0.54/18=0.03 moles of H2O
Ratio of Moles of CO2 to H2O is 2:1
C2H2+5/2O2-->2CO2+H2O
At STP 1 mole occupies 22.4 Litre
V=22.4*Number of moles
10=22.4*34.8/Molar Mass
Molar Mass:77.952
77.952/(12*2)+2=2.99
2.99*C2H2=C6H6