Question

Which of the following has greater mass? Justify 0.5 mole of CO2 or 0.7 mole of NH3 . (2)
(Given the atomic masses of C=12u, O=16u, N=14u, H=1u)

Answer 1

Answer:

0.1 mole of carbon dioxide (CO_2)(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}6.023×10

23

of particles.

a) 1 mole of carbon dioxide (CO_2)(CO

2

) weighs = 44 g

0.1 mole of carbon dioxide (CO_2)(CO

2

) weighs = \frac{44}{1}\times 0.1=4.4g

1

44

×0.1=4.4g

b) 1 mole of ammonia (NH_3)(NH

3

) weighs = 17 g

0.2 mole of ammonia (NH_3)(NH

3

) weighs = \frac{17}{1}\times 0.2=3.4g

1

17

×0.2=3.4g

Thus 0.1 mole of carbon dioxide (CO_2)(CO

2

) has greater mass.

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