Answer to Question #205247 in Chemistry for Sam

Question #205247

How many grams of Na2SO4 is needed to prepare a 2.0 L of 0.1 M Na2SO4?

Question 2 options:


A) 

28.2


B) 

7.05


C) 

56.4


D) 

14.1 


1
Expert's answer
2021-06-11T22:49:48-0400

CM = n / V

n (Na2SO4) = CM x V = 0.1 x 2.0 = 0.2 mol

n = m / M

M (Na2SO4) = 142.04 g/mol

m (Na2SO4) = n x M = 0.2 x 142.04 = 28.2 g

Answer: A) 28.2


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