Question

What mass of potassium chloride is produced when 2.99 g of potassium carbonate are used?

Answer 1

What mass of Potassium chloride is produced when 2.99 g of Potassium carbonate is used.

solution : when potassium carbonate reacts with hydrochloride, it gives potassium chloride, water and carbon dioxide.

i.e., K₂CO₃ + 2HCl ⇒2KCl + H₂O + CO₂

here you see, one mole of potassium carbonate produces 2 moles of potassium chloride.

molar mass of potassium carbonate = 138 g/mol

molar mass of potassium chloride = 74.5 g/mol

∴ 138g of potassium carbonate produces 2 × 74.5 = 149 g of potassium chloride.

∴ 2.99g of K₂CO₃ produces 149/138 × 2.99 = 3.23g of KCl

Therefore the mass of potassium chloride is 3.23g.

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Answer 2

when potassium carbonate reacts with hydrochloride, it gives potassium chloride, water and carbon dioxide.

i.e., K₂CO₃ + 2HCl ⇒2KCl + H₂O + CO₂

here you see, one mole of potassium carbonate produces 2 moles of potassium chloride.

molar mass of potassium carbonate = 138 g/mol

molar mass of potassium chloride = 74.5 g/mol

∴ 138g of potassium carbonate produces 2 × 74.5 = 149 g of potassium chloride.

∴ 2.99g of K₂CO₃ produces 149/138 × 2.99 = 3.23g of KCl

Therefore the mass of potassium chloride is 3.23g.