Question

Which one of the following pairs has same mass a) 1 mole of co and 1 mole of n2
b) 1 mole of co and 1 mole of co2
c) 1 mole of o2 and 1 mole of n2
d) 1 mole of o2 and 1 mole of co2

Answer 1

Concept:

one mole is defined as the amount of substance that contains same number of particles as there are in 12g of C-12 isotope.

Explanation:

• In option a, we know the total mass of Co is 28 and the mass of N2 is also 28 so they both have same mass.
• In option b, the total mass of Co is 28 but the mass of CO2 is 44 so they both don't have same mass
• In option c, the mass of O2 is 32 and the mass of N2 is 28 so they also don't have same mass.
• In option d, the mass of O2 is 32 but the mass of CO2 is 44 so they also don't have same mass.

Hence option (a) is correct.

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Answer 2

Concept:

The amount of substance that has the same number of elementary particles is referred to as a mole. Atoms, molecules, or ions are examples of such elementary particles.

Given:

1 mole of CO.

1 mole of $N_{2}$.

Find: Which one of the following pairs has the same mass?

Solution:

We know that the molar masses of carbon, nitrogen, and oxygen are as follows below:

The molar mass of carbon = 12 g/mol

The molar mass of nitrogen = 14 g/mol

The molar mass of oxygen = 16 g/mol

1 mole of CO = 1 carbon + 1 oxygen = 1*12 g/mol + 1*16 g/mol = 12 + 16 = 28 g/mol

1 mole of $N_{2}$ = 2 nitrogen = 2*14 g/mol = 28 g/mol

1 mole of CO2 = 1 carbon + 2 oxygen = 1*12 g/mol + 2*16 g/mol = 12 + 32 = 44 g/mol

Therefore, 1 mole of CO and $N_{2$ has the same mass.

Hence, the pair which has the same mass is 1 mole of CO and $N_{2}$.

The correct option is (a).

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