Question

What is the mass percent of potassium nitrate (KNO3) in a solution that is made bt dissolving 30.0g of potassium nitrate in 90.0 g of water.

A) 15.0%

B) 25.0%

C) 30.0%

D) 40.0%

E) 50.0%

Answer 1

The mass percent of potassium nitrate in the solution is 25.0% option b.

Step-by-step explanation:

To calculate the mass percent of potassium nitrate (KNO3) in the solution, we first need to determine the total mass of the solution. The mass of the potassium nitrate is 30.0g, and the mass of water is 90.0g, so the total mass is 30.0g + 90.0g = 120.0g.

Next, we calculate the mass of KNO3 in the solution. The mass of KNO3 is 30.0g.

Finally, we divide the mass of KNO3 by the total mass of the solution and multiply by 100 to get the mass percent: (30.0g / 120.0g) * 100 = 25.0%.

Therefore, the mass percent of potassium nitrate in the solution is 25.0% option b.