# Answer to Question #20067 in Other Chemistry for Kalie

Question #20067

calcium comcentration of 55mg?L. What is its calcium concentration expressed in parts per million

Expert's answer

We firstly find theamount of substance of calcium:

n(Ca) = m/M

n(Ca) = 0.055g/40 = 0.001375 mol

using the following formula we can find theamount of substance:

n = N/N

on this basis:

N = N

N = 6.02x10^23 x 0.01337 = 8.27 x 10^20 particles of Ca

C(Ca) = 8.27 x 10^20 particles/ 1 liter = 8.27x10^20 parts

C(Ca) = 8.27x10^20*100000 liters = 8.27x10^14 parts per million

n(Ca) = m/M

n(Ca) = 0.055g/40 = 0.001375 mol

using the following formula we can find theamount of substance:

n = N/N

_{A}on this basis:

N = N

_{A}x nN = 6.02x10^23 x 0.01337 = 8.27 x 10^20 particles of Ca

C(Ca) = 8.27 x 10^20 particles/ 1 liter = 8.27x10^20 parts

C(Ca) = 8.27x10^20*100000 liters = 8.27x10^14 parts per million

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