Question #22144

If 1.63 x 10^-4 g of helium dissolves in 100.0 g of waer, what is the concentration in parts per million?

Expert's answer

C = N of He /N of H_{2}O

N of H_{2}O = m/M_{w} * 6.02*10^23 = 100.0/18 *6.02*10^23 =33.44 *10^23

N of He =m/M_{w} * 6.02*10^23 = (1.63 x 10^-4 / 4) *6.02*10^23= 0.000245 *10^23

If you have 0.000245 *10^23 atoms of He

per 33.44 *10^23 molecules of H_{2}O

You will have X atoms of He per 1000000

X = 7.34 parts per million

N of H

N of He =m/M

If you have 0.000245 *10^23 atoms of He

per 33.44 *10^23 molecules of H

You will have X atoms of He per 1000000

X = 7.34 parts per million

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