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A 70-g small metal ball was dropped in a 150 mL water contained in a constant-pressure...

A 70-g small metal ball was dropped in a 150 mL water contained in a constant-pressure calorimeter. The changed in water temperature is observed to be 1.21C°. Calculate the heat lost by the small metal ball.

Calculate the standard enthalpy of reaction: 2F2(?)+2H2O(?)→4HF(?)+O2(?).
Δ?°? (F2,?)=0kJmol; Δ?°? (O2,?)=0 kJ/mol; Δ?°? (HF,?)=−268.61 kJ/mol; Δ?°? (H2O,?)=−285.8 kJ/mol

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