40 g of NaOH (molar mass 40 g/mol) is dissolved to make 500 mL of solution. What is the concentration?
Answer and explanation
Correct answer: D. 2 mol/L
- Step 1: Moles = 40/40 = 1.
- Step 2: c = 1/0.5 = 2 mol/L.
Answer
2 mol/L.
Why not the others: 0.002 mol/L, 80 mol/L and 4 mol/L do not fit.
Practise more Moles, gases and solutions.
Free questions with an explanation for every one, and full timed Tahsili SAAT (Saudi Arabia) mock tests.
More Moles, gases and solutions questions
- How many moles are in 500 g of CaCO₃? (Molar mass 100 g/mol)
- How many moles are in 80 g of MgO? (Molar mass 40 g/mol)
- How many moles are in 200 g of NaOH? (Molar mass 40 g/mol)
- How many moles are in 24 g of CH₄? (Molar mass 16 g/mol)
- How many moles are in 18.25 g of HCl? (Molar mass 36.5 g/mol)
- How many moles are in 150 g of CaCO₃? (Molar mass 100 g/mol)