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98 moles of H₂O.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2HCl + CaCO₃ —> CaCl₂ + H₂O + CO₂

From the balanced equation above,

1 mole of CaCO₃ reacted to produce 1 mole of H₂O.

Finally, we shall determine the number of mole of H₂O produced by the reaction of 98 moles of CaCO₃. This can be obtained as follow:

From the balanced equation above,

1 mole of CaCO₃ reacted to produce 1 mole of H₂O.

Therefore, 98 moles of CaCO₃ will also react to produce 98 moles of H₂O.

Thus, 98 moles of H₂O were obtained from the reaction.