What is the heat of formation of water in kcal mol?

Answer 1

Unknown without data....

We deal with the formula.

#H_2(g) + 1/2O_2(g) rarr H_2O(l) + DeltaH^@#

#DeltaH_"rxn"^@=DeltaH_f^@("water")=-285.5*kJ*mol^-1#...and when we write #DeltaH_"rxn"^@# we mean per moles of reaction as written....were we to double the given equation...to give...

#2H_2(g) + O_2(g) rarr 2H_2O(l) + DeltaH^@#

#Delta_"rxn"^@=2xx-285.5*kJ*mol^-1=??#

It is necessary to determine the ratio of calories to Joules and vice versa.

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Answer 2

Kai Bowman

The heat of formation of water is approximately -68.3 kcal/mol.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.