Question

How many grams of naoh (mw = 40.0) are there in 200.0 ml of a 0.150 m naoh solution?

Answer 1

First, determine the number of moles of NaOH by multiplying the volume given with the molarity.
n = (200 mL)(1 L/1000 mL)(0.150 mole/L)
n = 0.03 moles

Then, multiply the calculated number of moles above with the given molar weight.

m = (0.03 moles)(40 g/mol)
m = 1.2 g

Answer: 1.2 grams of NaOH