The atomic mass of potassium is 39.1. What is the mass of 6.02 * 1023 atoms of potassium? A. 39.1 mg B. 39.1 g C. 39.1 kg D. 6.02 * 39.1 mg E. 6.02 * 39.1 g

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Chemistry

Creep

19 March, 18:13

The atomic mass of potassium is 39.1. What is the mass of 6.02 * 1023 atoms of potassium? A. 39.1 mg B. 39.1 g C. 39.1 kg D. 6.02 * 39.1 mg E. 6.02 * 39.1 g

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Chang · Answer 1

B. 39.1 g.

Explanation:

It is known that every 1.0 mole of any atom contain Avogadros no. of atoms (6.022 x 10²³).

∴ 6.02 x 10²³ atoms are in 1.0 mol of K.

We need to calculate the mass of 1.0 mol of K using the relation:

∴ mass of K = no. of moles of K x atomic mass of K = (1.0 mol) (39.1 g/mol) = 39.1 g.