A solution contains 28% phosphoric acid by mass. This means that __________.
- 1 L of this solution has a mass of 28 g
- 1 L of this solution contains 28 mL of phosphoric acid
- 1 mL of this solution contains 28 g of phosphoric acid
- 100 g of this solution contains 28 g of phosphoric acid
- the density of this solution is 2.8 g/mL
Answer: 100 g of this solution contains 28 g of phosphoric acid