A small conical flask contains 72g of petrol C8H18.How many molecules of petrol are there in the flask.(C=12, H=2, NA=6.02×10^23
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Answer:
As we know : density=
volume
mass
given density of octane = 0.8 g/mL
Volume of octane = 1.425 L
∴mass of octane=0.8×1.425×1000=1140g
Molecular mass of octane (C
8
H
18
) = 114g
Thus moles of octane =
114
1140
=10
Combustion of octane takes place as follow:
2C
8
H
18
+25O
2
→16CO
2
+18H
2
O
No. of moles of O
2
required for the combustion of 1 mole of octane = 12.5 moles
∴No. of moles required for the combustion of 10 moles of octane =12.5×10=125
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