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QUESTION

# How many hydrogen atoms are in each formula unit of calcium bicarbonate Ca(HCO_3)_2?

two

Looking closely at the part (HCO_3)_2.

In the bracket there is one hydrogen. But outside the bracket, there is a number 2.

It means the number of hydrogen inside the brackets xx 2: [H xx 2] = H_2. Therefore there are two hydrogen atoms present.