1 C8H18 molecule has 18 H atoms.
So,
Number of C8H18 molecules = number of H atoms / 18
= (8.0*10^25) / 18
= 4.44*10^24 molecules
use:
number of mol = number of molecules / Avogadro’s number
number of mol = 4.44*10^24 / 6.022*10^23 mol
number of mol = 7.373 mol
Molar mass of C8H18,
MM = 8*MM(C) + 18*MM(H)
= 8*12.01 + 18*1.008
= 114.224 g/mol
use:
mass of C8H18,
m = number of mol * molar mass
= 7.373 mol * 1.142*10^2 g/mol
= 8.422*10^2 g
Now use:
Volume = mass / density
= (8.422*10^2 g) / (0.703 g/cm^3)
= 1.198*10^3 cm^3
Answer: C
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