Question

How many grams of NaOH are needed to make 0.250 liter of a 0.500 M solution of NaOH? 0.125 g 5.00 g 2.00 g

Answer 1

Step-by-step explanation:

0.5 times 39.98(mass of NaOH) = 19.99.../ 0.25= 4.99 so 5.00

Answer 2

5.00g

Step-by-step explanation:

Molarity is moles per liter

Therefore:

x moles/.250L = .5 moles/1L

Solve for x: .125 moles required

Question asks for grams of NaOH so multiply the moles by the molar mass of NaOH

.125(39.997) = 4.999625g

Rounds to 5.00g