Question

Calculate the number of atoms in 20 grams of calcium​

Answer 1

Answer:

The answer is about 20 grams. The mass of 1 calcium atom is 40 amu, so the mass of a mole of calcium atoms would be 40 grams.

Answer 2

The answer is 3.022 × 10²³ atoms

GIVEN

Mass of calcium = 20 grams

TO FIND

Number of atoms

SOLUTION

The above problem can be simply solved as follows;

Molar mass of Calcium = 40 grams

Therefore,

Number of atoms in 40 grams of Calcium = 6.022 × 10²³

Number of atoms in 20 grams = 6.022 × 10²³ × (20/40)

= 3.022 × 10²³ atoms

Hence, The answer is 3.022 × 10²³ atoms

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