Determine the mass fraction of the substance in the solution obtained by dissolution:

| September 25, 2021 | education

Determine the mass fraction of the substance in the solution obtained by dissolution: A) 4 g of sodium hydroxide in 36 g of water B) 12 g of barium hydroxide in 488 g of water C) 16 g of potassium hydroxide in 64 g of water

Determine the mass fraction of the substance in the following solutions obtained by dissolution:
A) 4 g of sodium hydroxide in 36 g of water
B) 12 g of barium hydroxide in 488 g of water
C) 16 g of potassium hydroxide in 64 g of water
Option a
We consider the mass of the solution
m solution = 4 g + 36 g = 40 g
Next, we use the following formula:
W = m r.v / mr-ra × 100%
W = 4/40 ÷ 100 = 10%
Answer: W = 10%.
Option B
m solution = 12 g + 488 g = 500 g
W = 12/500 × 100% = 2.4%
Answer: W = 2.4%.
Option B
m solution = 16 g + 64 g = 80 g
W = 16/80 × 100% = 20%
Answer: W = 20%.



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