20 g of salt are dissolved in water to make 400 ml of solution. What is the concentration in g per 100 ml?
Answer and explanation
Correct answer: D. 5 g/100 ml
- Step 1: Concentration per 100 ml = mass / volume x 100. Step 2. 20 / 400 x 100 = 5 g per 100 ml. Answer: 5 g/100 ml. Why not the others: 0.05 g/100 ml: the result was not scaled to 100 ml. 80 g/100 ml: the quantities were multiplied. 0.5 g/100 ml: the result was divided by 10.
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