Water and Empirical Formula
PERCENTAGE COMPOSITION WORKSHEET
1. Calculate the COMPLETE percentage composition (by mass) of the following:
(a) iron (III) oxide (Fe = 70.0%, O = 30.0%)
(b) barium phosphate (Ba = 68.4%, P = 10.3%, O= 21.3%)
2. What is the percentage of sodium (by mass) in sodium phosphate? (42.1%)
3. For the hydrate sodium sulfate decahydrate, calculate the following:
(a) the percent of sodium (by mass) in the hydrate (14.3%)
(b) percent of TOTAL oxygen (by mass) in the hydrated compound. (69.6%)
(c) Percent of water (by mass) in the hydrate (55.9%)
4. Calculate the percentage of nitrogen (by mass) in the ammonium nitride (82.4%)
Moles Worksheet
1. How many moles are there in 768 grams of iron (III) sulfate?(1.92 mol)
2. How many moles are there in 1.2 kg of potassium dichromate?(4.1 mol)
3. You have 13.2 moles of lead (II) nitrate. How many grams is this? (4.37 x 103 g)
4. How many pounds would 5.75 moles of magnesium hydroxide weigh?(0.739 lb)
5. How many moles are there in 78 grams of nitrogen gas?(2.8 mol)
EMPIRICAL FORMULA WORKSHEET
1. What is the empirical formula for a compound which contains 0.0134 g of iron, 0.00769 g of sulfur and 0.0115 g of oxygen? (FeSO3)
2. Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine. (CrCl3)
3. NAME the compound which contains 0.463 g Tl (#81), 0.0544 g of carbon, 0.00685 g of hydrogen and 0.0725 g of oxygen by finding its empirical formula. (TlC2H3O2)
4. What is the empirical formula for a compound which contains 67.1% zinc and the rest is oxygen? (ZnO2)
5. Barry Um has a sample of a compound which weighs 200 grams and contains only carbon, hydrogen, oxygen and nitrogen. By analysis, he finds that it contains 97.56 grams of carbon, 4.878 g of hydrogen, 52.03 grams of oxygen and 45.53 grams of nitrogen. Find its empirical formula. (C5H3O2N2)
1. Calculate the COMPLETE percentage composition (by mass) of the following:
(a) iron (III) oxide (Fe = 70.0%, O = 30.0%)
(b) barium phosphate (Ba = 68.4%, P = 10.3%, O= 21.3%)
2. What is the percentage of sodium (by mass) in sodium phosphate? (42.1%)
3. For the hydrate sodium sulfate decahydrate, calculate the following:
(a) the percent of sodium (by mass) in the hydrate (14.3%)
(b) percent of TOTAL oxygen (by mass) in the hydrated compound. (69.6%)
(c) Percent of water (by mass) in the hydrate (55.9%)
4. Calculate the percentage of nitrogen (by mass) in the ammonium nitride (82.4%)
Moles Worksheet
1. How many moles are there in 768 grams of iron (III) sulfate?(1.92 mol)
2. How many moles are there in 1.2 kg of potassium dichromate?(4.1 mol)
3. You have 13.2 moles of lead (II) nitrate. How many grams is this? (4.37 x 103 g)
4. How many pounds would 5.75 moles of magnesium hydroxide weigh?(0.739 lb)
5. How many moles are there in 78 grams of nitrogen gas?(2.8 mol)
EMPIRICAL FORMULA WORKSHEET
1. What is the empirical formula for a compound which contains 0.0134 g of iron, 0.00769 g of sulfur and 0.0115 g of oxygen? (FeSO3)
2. Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine. (CrCl3)
3. NAME the compound which contains 0.463 g Tl (#81), 0.0544 g of carbon, 0.00685 g of hydrogen and 0.0725 g of oxygen by finding its empirical formula. (TlC2H3O2)
4. What is the empirical formula for a compound which contains 67.1% zinc and the rest is oxygen? (ZnO2)
5. Barry Um has a sample of a compound which weighs 200 grams and contains only carbon, hydrogen, oxygen and nitrogen. By analysis, he finds that it contains 97.56 grams of carbon, 4.878 g of hydrogen, 52.03 grams of oxygen and 45.53 grams of nitrogen. Find its empirical formula. (C5H3O2N2)