How many atoms are in 0.23 moles of calcium?

1.385 × 10²³ atoms of calcium

Explanation:

Given data:

Number of moles of calcium = 0.23 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 0.23 mole of calcium:

one mole =  6.022 × 10²³ atoms of calcium

0.23 ×  6.022 × 10²³ atoms of calcium

1.385 × 10²³ atoms of calcium

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the answer is d.) potassium