# math

1.How many grams of carbon monoxide are needed to react with an excess of iron (III) oxide to produce 198.5 grams of iron? Fe2O3(s) + 3CO(g) ----- 3CO2(g) + 2Fe(s) Show all work!
2.Hydrogen gas can be made by reacting methane (CH4) with high temperature steam: CH4(g) + H2O(g) ----- CO(g) + 3H2(g)
How many hydrogen molecules are produced when 256 grams of methane reacts with steam?
3.Ammonia (NH3) reacts with oxygen (O2) to produce nitrogen monoxide (NO) and water (H2O). Write and balance the chemical equation. How many liters of NO are produced when 2.0 liters of oxygen reacts with ammonia? Show all work!
4.Phosphoric acid reacts with sodium hydroxide: H3PO4(aq) + 3NaOH(aq) --- Na3PO4(aq) + H2O(l)
If 3.50 mol H3PO4 is made to react with 10.0 mol NaOH, identify the limiting reagent. Show all work!
Can anyone help thanks!

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1. these are all pretty much alike. For #1,
Fe2O3 + 3CO --> 3CO2 + 2Fe
Each mole of Fe2O3 produces 2 moles of Fe
198.5g Fe = 3.373 moles Fe
So, since 3 moles CO produce 2 moles Fe, we need 3/2 * 3.373 = 5.06 moles CO
That means we need 141.677 g CO

See what you can do with the others ...

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