How can i find the volume if i don't know the mass to find mol

question: the chemical equation below shows the reaction between calcium carbonate and hydrochloric acid. calculate the maximum volume of carbon dioxide gas produced.
CaCO3 + 2HCl = CaCl2 + CO2 + H2O

CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + CO2(g) + H2O(l)

Based on your question, the original question itself must be flawed. In order to determine the volume of CO2 produced we must know the amount of the limiting reactant, or an amount of some other product. There must be some other number to establish the mole ratio so that you can determine the moles and corresponding volume of carbon dioxide.

Look carefully at the question. There may be a mass of calcium carbonate hiding there, or if this is part of a series of questions on this reaction, the mass may be given in a previous problem.

This gets even worse - atomic mass of Ca is not 64amu , but 40 amu. Even this extra data does not help. There must be some missing data concerning mass of reactants for example.

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I find it hard to believe that askers are seemingly unable to provide the information which must be given in the original question. Yet they expect an answer. Not possible without all the information.

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There must be moire information in this question than you are submitting. No teacher or textbook would include only this information in a question and expect you to answer it - it is impossible.
Review the full question and submit the full question - and I do mean the full question - and you will be helped.

There's not enough info in that question to get an answer. Maybe that's not the whole question...

This equation suggests that there is 1 mole CaCO3 which gives 1 mole CO2
1 mole CO2 at S.T.P. has a vol. of 22.4 L