The total mass of carbon in living plants and
animals on Earth is approximately 7.5 × 1017
g. How many parts per million of the total
mass of earthly carbon (7.5 × 1022 g) does
this represent?
[17-22] = [-5]
[6-5] = [1] = 10 ppm.
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[17-22] = [-5]
[6-5] = [1] = 10 ppm.