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Calculate the heat of formation of water from its constituent elements from the following information:

3 H2 (g) + O3 (g) → 3H2O ∆H = ?
2 H2 (g) + O2 (g) → 2H2O ∆H = - 483.6
3 O2 (g) → 2O3 (g) ∆H = 284.5

You are given 2.0 grams of zinc and 2.5 grams of silver nitrate and are told they react in the following manner: ZnĀ¬(s) + 2AgNO3(aq) → 2Ag(s) + Zn(NO3)2 (aq). How many grams of silver are produced?

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