Title: CHEMISTRY I
Author: WISD
Last saved by: jtharp

CHEMISTRY I - Homework
“Percent Yield”

SHOW ALL WORK, AND  INCLUDE PROPER UNITS!!!

1)	What is percent yield a measure of?  (answer:  look it up in your notes ☺ )

2)	When 84.8 grams of iron (III) oxide reacts with an excess of carbon monoxide, carbon dioxide and 57.8 grams of iron metal is produced.  What is the % yield of iron?  (answer: 97.5%)
___ Fe_2O_3 + ___ CO 🡪 ___ CO_2 + ___ Fe

3)	What is the % yield of silicon carbide if 50.0 grams of silicon dioxide is reacted with an excess of carbon to producing carbon monoxide and 25.5 grams of silicon carbide?  (answer:  76.3%)
___ SiO_2 + ___ C 🡪 ___ CO + ___ SiC

4)	What is the % yield of copper if aluminum sulfate and 3.74 grams of copper metal are produced when 1.87 grams of aluminum metal is reacted with an excess of copper (II) sulfate?
	(answer:  56.7%)
___Al + ___ CuSO_4 🡪 ___ Al_2(SO_4)_3 + ___ Cu

	

			
5)	75.0 grams of carbon monoxide reacts with an excess of hydrogen gas to produce methanol.  
	If 68.4 grams of methanol is produced, what is its % yield?  (answer:  79.8%)
___ CO + ___ H_2 🡪 ___ CH_4O

6)	When 16.4 grams of copper metal reacts with an excess of silver sulfate, silver metal and 
26.8 grams of copper (I) sulfate is produced.  What is the % yield of copper (I) sulfate?
      (answer:  93.1%)
___ Cu + ___ Ag_2SO_4 🡪 ___ Ag + ___ Cu_2SO_4

7) When heated, 175 grams of potassium carbonate decomposes to produce carbon dioxide and 
	92.32 grams of potassium oxide.  What is the % yield of potassium oxide?  (answer:  77.4%)
___ K_2CO_3 🡪 ___ CO_2 + ___ K_2O

8) 40.0 grams of hydrogen was reacted with an excess of oxygen.  If 80.0 grams of water was 
     produced, what was its percent yield?  (answer:  22.2%)
___ H_2 + ___ O_2 🡪 ___ H_2O

9)  If 59 grams of chlorine gas reacts with an excess of sodium to produce 99 grams of sodium 
     chloride, what is the percent yield?  (answer:  102.1%)
___ Cl_2 + ___ Na 🡪 ___ NaCl

10) When a 1.00 gram sample of limestone (calcium carbonate) was dissolved in hydrochloric 
       acid, calcium chloride, water and 0.38 grams of carbon dioxide gas was generated.  What is 
       the percent yield of carbon dioxide?  (answer:  86.4%)
___ CaCO_3 + ___ HCl🡪 ___ CaCl_2 + ___ H_2O + ___CO_2