Answer:
C.) 42 grams NaOH
Explanation:
To find the mass of NaOH, you need to (1) find the moles (using the molarity equation) and then (2) convert moles to grams (using the molar mass).
(Step 1)
250.0 mL / 1,000 = 0.2500 L
Molarity = moles / volume (L)
4.2 M = moles / 0.2500 L
1.05 = moles
(Step 2)
Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.996 g/mol
1.05 moles NaOH 39.996 g
----------------------------- x ------------------ = 42 grams NaOH
1 mole
