Middle School

What is the molarity of a 250.0 milliliter aqueous solution of sodium hydroxide that contains 15.5 grams of solute?

A. 6.2 M
B. 0.00155 M
C. 0.062 M
D. 1.55 M
E. 62 M

Answer :

hey there:

Molar mass NaOH = 39.997 g/mol

Number of moles:

n = m / mm

n = 15.5 / 39.997

n = 0.387 moles

Volume in liters:

250.0 mL / 1000 => 0.25 L

Therefore:

M = n / V

M = 0.387 / 0.25

= 1.55 M

Answer D

hope this helps!

Answer:

A. 6.2 M

B. 0.00155 M

C. 0.062 M

D. 1.55 M

E. 62 M

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