10 g sodium hydroxide is dissolved in 250 mL solution. Molar mass is 40 g per mole. What is the molarity?
Answer and explanation
Correct answer: 1.0 mole per litre
Molarity is defined as the number of moles of solute divided by the volume of the solution in litres. Moles of NaOH = 10 g ÷ 40 g mol−1 = 0.25 mol. The solution volume is 250 mL = 0.250 L. Therefore, M = 0.25 ÷ 0.250 = 1.0 mol L−1, so option A is correct. Option B is the mole amount, while the other values result from incorrect conversion or division.
Frequently asked questions
What is the correct answer to this question?
1.0 mole per litre
Why is this the correct answer?
Molarity is defined as the number of moles of solute divided by the volume of the solution in litres. Moles of NaOH = 10 g ÷ 40 g mol−1 = 0.25 mol. The solution volume is 250 mL = 0.250 L. Therefore, M = 0.25 ÷ 0.250 = 1.0 mol L−1, so option A is correct. Option B is the mole amount, while the other values result from incorrect conversion or division.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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