25 g of CaCO₃ (molar mass 100 g/mol) is dissolved to make 500 mL of solution. What is the concentration?
Answer and explanation
Correct answer: B. 0.5 mol/L
- Step 1: Moles = 25/100 = 0.25.
- Step 2: c = 0.25/0.5 = 0.5 mol/L.
Answer
0.5 mol/L.
Why not the others: 0.001 mol/L, 50 mol/L and 1 mol/L do not fit.
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