Question

Solid iron(III) hydroxide decomposes to produce iron(III) oxide and water vapor. If 0.75 L of water vapor is produced at STP, how many grams of iron(lll) oxide were produced?

Answer 1

Step number one in almost all of stoichiometric analysis type questions:
write an equation for this, and balance it.

Answer 2

2Fe(OH)3 ---> 1Fe2O3 + 3H2O

Answer 3

awesome, now write an expression that ties in both the water and the iron(III) oxide. You don't need to use moles for this because the volume of ideal gases is proportional to the amount of moles.

1 mole of any ideal gas = 22.414 L

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For a general equation: aA +bB -> cC

where a,b,c (lowercase) are the coefficients and A,B,C are the species

\[\frac{ n _{A} }{ a }=\frac{ n _{B} }{ b }=\frac{ n _{C}}{ c }\]

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