Question

Which of the following has greater mass? Justify.
0.1 mole of CO2 or 0.2 mole of NH3 (N=14, H=1, C=12 and O=16u)

Answer 1

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The mass of 1 mole of oxygen atoms is 16, which is the gram molecular weight. So, for one mole of atoms the weight is 16. 0.2 moles of atoms the weight will be 16*0.2 which is equal to 3.2 grams.



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Answer 2

0.1 mole of carbon dioxide $(CO_2)$ has greater mass.

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

a) 1 mole of carbon dioxide $(CO_2)$ weighs = 44 g

0.1 mole of carbon dioxide $(CO_2)$ weighs = $\frac{44}{1}\times 0.1=4.4g$

b) 1 mole of ammonia $(NH_3)$ weighs = 17 g

0.2 mole of ammonia $(NH_3)$ weighs = $\frac{17}{1}\times 0.2=3.4g$

Thus 0.1 mole of carbon dioxide $(CO_2)$ has greater mass.

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