Final answer:
To find the concentration expressed in ppm, divide the mass of the solute by the mass of the solution and multiply by 10^6. In this case, the concentration of the solution containing 15.0 grams of KNO₃ in 65.0 grams of H₂0 is 230,769 ppm.
Step-by-step explanation:
To find the concentration of the solution expressed in ppm (parts per million), we need to calculate the mass of KNO₃ and the mass of the solution. The concentration in ppm is calculated by dividing the mass of solute (KNO₃) by the mass of solution (H₂0) and multiplying by 10^6.
First, let's calculate the mass of KNO₃:
Mass of KNO₃ = 15.0 g
Next, let's calculate the mass of the solution (H₂0):
Mass of H₂0 = 65.0 g
Now, let's calculate the concentration expressed in ppm:
Concentration (ppm) = (mass of KNO₃ / mass of H₂0) x 10^6
Concentration (ppm) = (15.0 g / 65.0 g) x 10^6
Concentration (ppm) = 230,769 ppm