Question

Can someone please explain this to me! How many atoms of oxygen are in 5.00 g...

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

Homework Answers

Answer #1

Molar mass of ethanol (C2H5OH) = 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 (C2H5OH) contains one mole of oxygen atom, thus, 0.108 mole of  ethanol (C2H5OH) contains 0.108 mole of oxygen atom

one mole atom = 6.023 x 1023 number of atoms

or, 0.108 mole of oxygen = (0.108) x 6.023 x 1023 number of atoms = 6.51 x 1022 number of atoms

Ans - "A"

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