How many grams of hydrogen is contained in 12 grams of carbonic acid.

Mr (H2CO3) = 62
M (H) = 1
Based on the fact that there are 2 hydrogen atoms in carbonic acid, then: 1 * 2 = 2
We get the relation:
2/62 = x / 12
It follows from this: 2 * 12/62 = 0.39 g



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