Question

PLEASE HELP , what is the concentration of Br, molecules in a solution containing 1.6g of bromine in 250cm of solution

Answer 1

The concentration of the bromine solution, given the data is 0.04 M

What is molarity?

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

How to determine the mole of bromine molecule (B₂)

• Mass of B₂ = 1.6 g
• Molar mass of bromine molecule (B₂) = 80 × 2 = 160 g/mol
• Mole of bromine molecule (B₂) = ?

Mole = mass / molar mass

Mole of bromine molecule (B₂) = 1.6 / 160

Mole of bromine molecule (B₂) = 0.01 mole

How to determine the molarity of the bromine solution

• Mole of bromine molecule (B₂) = 0.01 mole
• Volume of solution = 250 cm³ = 250 / 1000 = 0.25 L
• Molarity bromine solution =?

Molarity = mole / Volume

Molarity bromine solution = 0.01 / 0.25

Molarity bromine solution = 0.04 M

Thus, molarity of the bromine solution is 0.04 M

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