When doing a calorimeter experiment my early temperature, Chemistry

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When doing a calorimeter experiment my early temperature

When doing a calorimeter experiment, my early temperature was21.C. while the MgO was added the first reading was 26.C and peaked at 30.1C. How would compute q, the amount of moles of MgO (0.25g of MgO were mixed with 20mL of hydrochloric acid of 1mol *L-1). Lastly, what is the ΔH for this?

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