Question

What is the volume of a 1.25 M solution

if it contains 42 grams of sodium
hydroxide.
Volume NaOH = [?] mL

Answer 1

You could calculate the answer given the formula

M = mol/L

you can get mol using g/MolarMass

=> 42g/22.99g/mol = 1.82688125mol

1.25M = 1.82688125mol/V

=> apply simple algebra
V = 1.4615 L
=> Notice that the answer requires the unit to be ml
V = 1.4615L * 1000ml/L = 1461.5ml

=> Notice that the given grams have 2 sig figs

V = 1500 ml