Question #205247

How many grams of Na_{2}SO_{4} is needed to prepare a 2.0 L of 0.1 M Na_{2}SO_{4}?

Question 2 options:

A)

28.2

B)

7.05

C)

56.4

D)

14.1

Expert's answer

C_{M} = n / V

n (Na_{2}SO_{4}) = C_{M} x V = 0.1 x 2.0 = 0.2 mol

n = m / M

M (Na_{2}SO_{4}) = 142.04 g/mol

m (Na_{2}SO_{4}) = n x M = 0.2 x 142.04 = 28.2 g

Answer: A) 28.2

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