Chemistry-1 Name :
Worksheet : Stoichiometry problems #4 Date :
A. Solve the following stoichiometry problems (You must write and balance the equations first).
1. If 20.0 g of zinc reacts with excess hydrochloric acid, how many grams of zinc chloride are produced?
2. How many liters of chlorine gas(at STP) must be reacted with excess sodium iodide if 10.0 g of sodium chloride is produced?
3. How many grams of copper are required to replace 4.00 g of silver nitrate which is dissolved in water? (Hint : The copper(II) ion is more likely to form than the copper(I) ion).
4. When sulfuric acid (H2SO4) reacts with sodium chloride, sodium sulfate and hydrochloric acid (HCl) are formed. If excess sulfuric acid reacts with 30.0 g of sodium chloride, how many grams of hydrochloric acid are produced?
5. When aluminuim metal reacts with sodium hydroxide, sodium aluminum oxide (Na3AlO3) and hydrogen gas are formed. How many moles of hydrogen can be produced from 8.40 g of aluminum and excess sodium hydroxide? How many grams?
6. When calcium chloride reacts with sodium phosphate, calcium phosphate precipitates out and sodium and chloride ions are left in solution (NaCl). How many grams of calcium chloride would be necessary to prepare 94.0 g of calcium phosphate?
7. Calculate the number of grams of oxygen that could be produced by heating 9.70 g of potassium chlorate (products are potassium chloride and oxygen gas)?
Answers : 1. 41.7 g 2. 1.92 L 3. 0.748 g 4. 18.7 g 5. 0.467 mol, 0.943 g 6. 101 g 7. 3.80 g
Chemistry-1 Name :
Worksheet ; Stoichiometry #3 Date :
1. Balance and determine the relative quantities of particles, moles, mass and volume for the following equation (at STP):
2 NO(g) + O2(g) -----> 2 NO2(g)
a. particles : _____ molecules NO : _____ molecules O2 : _____ molecules NO2
b. moles : _____ moles NO : _____ moles O2 : _____ moles NO2
c. mass : ______g NO : ______grams O2 : ______grams NO2
d. volume : ______L NO : ______L O2 : ______L NO2
2. Based on the above reaction how many liters of nitrogen dioxide gas will be produced from 12.0 g of nitrogen monoxide?
3. Based on the above reaction how many grams of nitrogen dioxide gas will be produced from 4.0 L of nitrogen monoxide at STP?
4. Baking soda (sodium hydrogen carbonate, or sodium bicarbonate) decomposes into sodium carbonate, water and carbon dioxide gas. This reaction causes breads and cookies to rise by the production of the carbon dioxide. Write the balanced equation for this reaction and determine how many grams of sodium bicarbonate are needed to produce 20.5 grams of carbon dioxide.
5. A common fertilizer is ammonium sulfate (NH4)2SO4 which is produced by combining sulfuric acid (H2SO4) and ammonia (NH3). Write the balanced equation for this reaction and determine the number of liters of ammonia (at STP) that are needed to react with 5.00 x 104 grams of sulfuric acid.
6. In the above reaction, how much ammonium sulfate (in grams) would be produced?
Answers : 1a. 2:1:2, 1b. 2:1:2 1c. 60.02g : 32.00g : 92.02 g 1d. 44.8 L : 22.4 L : 44.8 L 2. 8.96 L NO2 3. 8.2g NO2 4. 78.3 g NaHCO3 5. 2.28 x 104 L NH3 6. 6.74 x 104 g (NH4)2SO4