Question

which of the following contains one mole of molecules of the substance?
(a) 16g of oxygen
(b) 7g of Nitrogen
(c) 2g of Hydrogen
(d) 36g of water

Answer 1

Answer:(a)16gm Oxygen

Explanation:because Mole=mass/M.M.

Mass=16gm

M.M.of O2=16gm

Put the value:-

16/16=1

Answer 2

Concept:

A mole is the mass of a substance made up of an equal number of basic components.

Given:

(a) 16g of oxygen

(b) 7g of Nitrogen

(c) 2g of Hydrogen

(d) 36g of water

Find:

Which of the following has one mole of the substance present?

Solution:

The number of moles (n) can be calculated as:

                 (n) = Mass (m) / Molar mass (M)

The molar mass of oxygen = 16 g/mol

The molar mass. of Nitrogen = 14 g/mol

The molar mass. of hydrogen = 1 g/mol

The molar mass of water = 18 g/mol

Now, the number of molecules for the given substances can be calculated as:

            n (oxygen) = 16 g / 16 g/mol = 1 mol

          n (nitrogen) = 7 g /14 g/mol = 0.5 mol

       n (Hydrogen) = 2 g / 1 g/mol = 2 mol

              n (Water) = 36 g / 18 g/mol = 2 mol

Thus, The number of moles for the given substances are 1 mole, 0.5 moles, 2 moles, and 2 mol respectively.

Therefore, 16 grams of oxygen contains one mole of molecules of the substance.

Hence, the correct option is (a) 16g of oxygen

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