Question

Can someone please explain this to me! How many atoms of oxygen are in 5.00 g of ethanol, C2H6O?

**A. 6.52 ×
1022 **
B.
9
C. 5.52 ×
1024
D. 6.02 × 1023

Answer #1

Molar mass of ethanol (C_{2}H_{5}OH) = 46 gm /
mole, i.e.- one mole of ethanol weigh 46 gm.

moles of ethanol available = mass / molar mass = 5 gm / 46 gm / mole = 0.108 mole

one mole of ethanol (C_{2}H_{5}OH)
contains one mole of oxygen atom, thus, 0.108 mole
of ethanol (C_{2}H_{5}OH) contains 0.108
mole of oxygen atom

one mole atom = 6.023 x 10^{23} number of atoms

or, 0.108 mole of oxygen = (0.108) x 6.023 x 10^{23}
number of atoms = 6.51 x 10^{22} number of atoms

**Ans - "A"**

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