Answer:
353 ppm
Explanation:
PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in 1000 mL, equivalent to 1 mg per liter
Given that;
276 mg of Ca in 780.0 g of water
1 ppm = 1 mg/L
780 g = 780 mL = 0.78 L
Therefore;
= 276 mg/ 0.78 L
= 353.84mg/L
= 353 ppm
