Stoichiometry, Limiting Reactant, Percent Yield Problems



Name: Date: Period:

All of Stoichiometry, Limiting Reactant, Percent Yield Study guide

(due the day of the test)

1. How many moles are there in 10 grams of Li? How many atoms?

2. What is the percent composition of each element for sucrose C12H22O11? How many grams of carbon do you have in 200 grams of sugar?

3. A 25 gram sample of an unknown hydrocarbon is composed of 12.16 g carbon, 2.027 g hydrogen, and 10.81 g oxygen. If its molar mass is 148 g/mol, what is the empirical and molecular formula for this compound?

4. How many grams of NH3 can be produced from the reaction of 28 grams of N2 and 25 grams of H2 in the Haber process? What is your limiting reactant? What is your excess reactant and how much of it do you have in grams?

|grams | | | |

| ___N2 + ___ H2 ( ___NH3 |

|grams/mole | | | |

|moles | | | |

5. How many grams of hydrogen is produced from the reaction of 50.0 g of Mg and 75 grams of HCl in the following reaction. What is your limiting reactant? What reactant is in excess and how many grams of it do you have left?

|grams | | | | |

| ____Mg + ___HCl ( ___MgCl2 + ___H2 |

|grams/mole | | | | |

|moles | | | | |

6. Given the following reaction determine the theoretical yield of KCl if you start with 34.5 grams of NH3. The reaction used 34.5 g of NH3, but you were only able to isolate 76.4 g of KCl, what is the percent yield?

|grams | | | | |

| ___K2PtCl4  + ___NH3   ( ___Pt(NH3)2Cl2  + ___KCl |

|grams/mole | | | | |

|moles | | | | |

7. If 49.0 g of phosphoric acid is reacted with excess potassium hydroxide, determine the percent yield of potassium phosphate if you only isolate 49.0 g of K3PO4.

|grams | | | | |

| ___H3PO4 + ___ KOH ( ___ H2O + ___K3PO4 |

|grams/mole | | | | |

|moles | | | | |

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download