How many grams of NaOH is needed to prepare 2 liters of 0.50 molar NaOH solution?
a. 20.0 g c. 80.0 g
b. 40.0 g d. 120.0 g
Molarity = number of moles of solute/volume of solution (in L)
Number of moles of solute = mass of solute(g)/molar mass of solute (g/mol)
Molarity = (mass/molar mass)*(1/volume in L)
0.50M =( mass(g)/40 (g/mol))x(1/2L)
Mass(g) = 0.50 mol/L x 2L x 40 g/mol = 40g
Answer: b. 40.0 grams
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