Question

How many grams of sodium hydroxide (NaOH) are dissolved in a total volume of 100 mL of solution with a sodium hydroxide concentration of 3 mol/L?

Answer 1

$$n(NaOH) = c(NaOH)V$$

$$n(NaOH) = 3 mol/L*0.1L = 0.3 mol$$

$$m(NaOH) = n(NaOH)M(NaOH)$$

$$m(NaOH) = 0.3mol*40.0g/mol = 12g$$