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Problem 55 Medium Difficulty

Does the standard enthalpy of formation of $\mathrm{H}_{2} \mathrm{O}(g)$ differ from $\Delta H^{\circ}$ for the reaction $2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(g) ?$

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Chemistry 101
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Video Transcript

So this question is asking us if there's a difference between the standard entropy of formation for H 20 and the equation to H two gas plus O two. Guess results in to age to O liquid. So remember that are heated formation equation is going to be made up of each of the individual elements in their standard state. So this is perfect so far. But you know that H two is normally found as a gas, and 02 is normally found as a gas in H 20 is normally found as a liquid. But the thing to remember is that heat in formation is for one mole of any substance. So therefore, for looking at our chemical reaction, this should be one mole. So if I Monica convert this equation into one mole of H 20 we're gonna have to divine everything by two. So two divided by two is gonna give me one. So it should be one more h two gas class. This is gonna be 1/2 and so normally we always wanna be using whole numbers for our coefficients of chemical equations. But in when we're doing Hess's Law and entities of formation and things like that. Um, the coefficients can be fractional, and that will be okay. So if we're actually focused on our heated formation, this is the equation. We should be looking at this red one as opposed to the one written in black. Thanks for watching.

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Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson

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