How many moles are there in 3.0 g of {O}₂\;?[{O}=16.0]

Correct Answer is : 0.0930 moles.

Correct Answer is : 0.0930 moles.

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WAEC Chemistry 2023 Paper

Question : 13

Total: 50

\mathrm{O}_2\;?[\mathrm{O}=16.0]

Solution:

Number of moles

=

Mass

/

Molar mass

Given that the molar mass of oxygen

\mathrm{O}_2

32.0\ \mathrm{g}/\mathrm{mol}\ (2 \times 16.0\ \mathrm{g}/\mathrm{mol})

, you can calculate the number of moles:

Number of moles

= \frac{3.0\ \mathrm{g}}{32.0\ \mathrm{g}/\mathrm{mol}} = 0.09375\ \mathrm{moles}

Rounded to four significant figures, the number of moles in 3.0 g of O 2 is approximately 0.0938 moles.

Therefore, the closest answer choice is:

0.0930 moles.

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