Question

What is the mass in grams of 5.57 × 10²⁵ molecules of Br₂

Answer 1

5.57 × 10²⁵ molecules of Br₂ will have a mass of 14862.33g

HOW TO CALCULATE MASS:

• The mass of an element can be calculated by multiplying the number of moles by its molar mass. That is;

mass (g) = moles (mol) × molar mass (g/mol)

• However, the number of moles in 5.57 × 10²⁵ molecules of Br₂ will be calculated first by dividing the number of molecules by Avogadro's number.

no. of moles = 5.57 × 10²⁵ ÷ 6.02 × 10²³

no. of moles = 5.57/6.02 × 10²⁵-²³

no. of moles = 0.93 × 10²

no of moles = 93 moles

Molar mass of Br₂ = 159.81g/mol

Mass of Br₂ = 93 × 159.81

Mass of Br₂ = 14862.33g

• Therefore, 5.57 × 10²⁵ molecules of Br₂ will have a mass of 14862.33g.

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