58.5 g sodium chloride is dissolved in 1 L solution. Molar mass is 58.5 g per mol. What is the molarity?
Answer and explanation
Correct answer: 1 M
The governing concept is molarity, defined as moles of solute per litre of final solution. The number of NaCl moles is n = 58.5 g ÷ 58.5 g mol⁻¹ = 1 mol. Since these 1 mol are present in 1 L solution, M = 1 mol ÷ 1 L = 1 M. Thus A is correct. B and C are incorrect numerical values, while D confuses grams with moles.
Frequently asked questions
What is the correct answer to this question?
1 M
Why is this the correct answer?
The governing concept is molarity, defined as moles of solute per litre of final solution. The number of NaCl moles is n = 58.5 g ÷ 58.5 g mol⁻¹ = 1 mol. Since these 1 mol are present in 1 L solution, M = 1 mol ÷ 1 L = 1 M. Thus A is correct. B and C are incorrect numerical values, while D confuses grams with moles.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chemical Bonding and Molecular Structure. Topic: Molecular Orbital Theory (MOT) of homonuclear diatomic molecules.
