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293 grams Fe₂S₃(s)

Explanation:

16Fe(s)  +     3S₈(s)     =>     8Fe₂S₃(s)

Excess  |   1.25 mole    |         ? grams

moles Fe₂S₈ produced = 8/3(1.25) mole Fe₂S₃(s) Yield = 3.33 mole  Fe₂S₃(s)

∴ grams of  Fe₂S₈ = 3.33 mole x 88 g/mole = 293 grams Fe₂S₃(s)

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.