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Explanation:

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7.5×10^23 molecules of carbon dioxide

Explanation:

H2CO3 → CO2 + H2O

From the balanced reaction equation, one mole of carbonic acid produces one mole of carbon IV oxide.

1.25 moles of carbonic acid will produce 1.25 moles of carbon dioxide

If 1 mole of carbon dioxide contains 6.02×10^23 molecules

1.25 moles of carbon dioxide contains 1.25×6.02×10^23= 7.5×10^23 molecules of carbon dioxide