Question

Which is a greater mass, 0.25 moles of carbon dioxide, CO2, or 1.5 x 1023 particles of carbon monoxide, CO?

Answer 1

0.25 moles of carbon dioxide has a greater mass which is equal to 11g.

There is a formula that reads,

"Mass = molecular mass × moles"

The molecular mass of carbon dioxide is 44 and remains constant.

Plugging in the equations we get,

Mass = 44 × 0.25

Mass of carbon dioxide = 11g.

Again, for mass of carbon monoxide, we get;

1 mole CO contains 6.022 × $10^{23}$ molecules of CO.

So, mass of 6.022 × $10^{23}$ molecules of CO = 28 g.

Therefore, mass of 1.5 × $10^{23}$ molecules of CO,

 (1.5×$10^{23}$ ×28) / (6.022×$10^{23}$) = 6.97g ≈ 7g

Therefore,  0.25 moles of carbon dioxide has a greater mass.

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