Question

Use the value of the Avogadro constant (6.02 × 1023 mol–1) to calculate the total number of atoms in 7.10 g of chlorine atoms. (Ar value: Cl = 35.5)​

Answer 1

The total number of atoms in 7.10g of chlorine is 1.204 × 10²³atoms.

HOW TO CALCULATE NUMBER OF ATOMS:

• The number of atoms in a substance can be calculated by multiplying the number of moles in that substance by Avogadro's number as follows:

• no. of atoms = no. of moles × 6.02 × 10²³ mol-¹

• The number of moles in 7.10g of Cl is calculated as follows:

no. of moles = mass ÷ molar mass

no. of moles = 7.10g ÷ 35.5g/mol

no. of moles = 0.2mol

no of atoms = 0.2mol × 6.02 × 10²³

no. of atoms = 1.204 × 10²³atoms.

• Therefore, the total number of atoms in 7.10g of chlorine is 1.204 × 10²³atoms.

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