# Chemistry

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1. Ca(OH)2 + H3PO4 ---> H2O + Ca3(PO4)2

(A) How many moles of H3PO4 are needed to make 15g of H2O?
(B) What mass in grams of Ca(OH)2 is used to react with 5.6mol of H3PO4?
(C) How many grams of Ca3(PO4)2 are made from 134g of Ca(OH)2?

2. Fe2O3 + CO ---> Fe + CO2

(A) If 110g Fe2O3 is allowed to react with 80g CO - which is the limiting reactant?
(C) How much excess reactant is left over?

3. NO + O2 --> NO2

(A) If 5 mol of NO and 2 mol of O2 are combined who limits the reaction?
(B) How many moles of the excess reactant remain unused?
(C) How much moles NO2 can be produced?

Optional 4. C + S8 --> CS2

(A) If I mix 16g of C and 70g of S8, what is the limiting reactant?
(C) How much excess reactant will remain after the experiment? - answer in grams

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