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Chemist ry
Teacher: Mr. J. Rowe
School: Washington Archibald High School
Due Date: Thursday, February 13, 2014
Please answer the following questions. SHOW ALL WORKING
1. Arrange the following in order of increasing number of atoms
a. 27g of Aluminum (Al)
b. 0.5 mol of Al
3
c. 50 dm of HNO3 at STP
d. 1 x 10
–2
mol of Al
e. 2.1 mol of Al
2. What information does the formula of ethanol (CH3CH2OH) contain? How many moles of ethanol are present in 920 g of ethanol?
3. Mr. Deeble recently opened his own chemical plant in Basseterre. His financial advisor Tyrah, has discovered a new technique for boosting company profit. If the company can cheaply extract the pure form of a new metal M from its oxide, the metal could be sold at 3x the price of production. What is the empirical formula of this oxide, given the following:
Total mass of metallic oxide: 80.763 g
Mass of metal is 74 % of the total mass
(It was later discovered the new metal held 11 protons, 12 neutrons & 11 electrons)
4. Mr. Collins went home and wanted to know about the following:
a. The number of moles of chlorine atoms in 3.08g of tetrachloromethane (CCl4)
b. The number of moles of fluorine atoms in 204 g of boron trifluoride BF3;
c. The number of moles of chloride in 5.55 g of calcium chloride, CaCl 2
d. The number of moles of sulphate ions in 144g of magnesium sulphate
3
e. The number of molecules in 1000 cm of barium nitrate
5. 100 cm3 of hydrogen chloride gas was mixed with a metallic compound producing a very volatile
& explosive reaction. What is the mass of this gas at RTP?
Chemist ry
6. A Compound that has 1 sulphur atom per molecule contains 17.3% of sulphur per mass. What is the relative molecular mass of this compound?
7. A compound M3N, contains 0.673g of nitrogen per gram of metal. What is the relative atomic mass of M? Identify M
8. The green pigment found in plants, chlorophyll, contains 1 magnesium atom per cholorophyll molecule. The
Teacher: Mr. J. Rowe
School: Washington Archibald High School
Due Date: Thursday, February 13, 2014
Please answer the following questions. SHOW ALL WORKING
1. Arrange the following in order of increasing number of atoms
a. 27g of Aluminum (Al)
b. 0.5 mol of Al
3
c. 50 dm of HNO3 at STP
d. 1 x 10
–2
mol of Al
e. 2.1 mol of Al
2. What information does the formula of ethanol (CH3CH2OH) contain? How many moles of ethanol are present in 920 g of ethanol?
3. Mr. Deeble recently opened his own chemical plant in Basseterre. His financial advisor Tyrah, has discovered a new technique for boosting company profit. If the company can cheaply extract the pure form of a new metal M from its oxide, the metal could be sold at 3x the price of production. What is the empirical formula of this oxide, given the following:
Total mass of metallic oxide: 80.763 g
Mass of metal is 74 % of the total mass
(It was later discovered the new metal held 11 protons, 12 neutrons & 11 electrons)
4. Mr. Collins went home and wanted to know about the following:
a. The number of moles of chlorine atoms in 3.08g of tetrachloromethane (CCl4)
b. The number of moles of fluorine atoms in 204 g of boron trifluoride BF3;
c. The number of moles of chloride in 5.55 g of calcium chloride, CaCl 2
d. The number of moles of sulphate ions in 144g of magnesium sulphate
3
e. The number of molecules in 1000 cm of barium nitrate
5. 100 cm3 of hydrogen chloride gas was mixed with a metallic compound producing a very volatile
& explosive reaction. What is the mass of this gas at RTP?
Chemist ry
6. A Compound that has 1 sulphur atom per molecule contains 17.3% of sulphur per mass. What is the relative molecular mass of this compound?
7. A compound M3N, contains 0.673g of nitrogen per gram of metal. What is the relative atomic mass of M? Identify M
8. The green pigment found in plants, chlorophyll, contains 1 magnesium atom per cholorophyll molecule. The