1. How many moles of fluorine gas are in 2.4dm3 at room temperature and pressure?

 

 

2. Analysis of a gaseous oxide of sulfur shows that it contains 60% oxygen by mass.( Ar values : S= 32, O=16)

   Calculate now many moles are there in 2460cm3 of the oxide at room temperature and pressure.

 

 

3. How many moles are there in 4g of sodium hydroxide?

 

 

4. A sample of an organic hydrocarbon was burnt completely in air. 4.4g of carbon dioxide and 1.8g of water were formed.

a) Calculate the number of moles of carbon in the hydrocarbon. (Relative atomic masses: H=1, C=12, O=16.)

 

b) Calculate the number of moles of hydrogen in the hydrocarbon.

 

 

5.Titration with 0.05 mol/dm3 sulfuric acid used to determine the concentration of calcium hydroxide solution. In the titration, 8.8 com3 of sulfuric acid was needed to nuetralise 10com3 of the calcium hydroxide solution.

a) How many moles of sulfuric acid reacted with the calcium hydroxide in the titration?

 

b) How many moles of calcium hydroxide reacted with the acid?

 

c) Calculate the concentration of the calcium hydroxide solution in mol/dm3. Show clearly how you work out your answer.

 

d) Calculate the concentration of the calcium hydroxide solution in g/dm3. The Mr for calcium hydroxide is 74. Show clearly your answer.

 

6. What is the volume of 4.5 moles of chlorine at room temperature and pressure?

 

 

7. How many moles are there in 8280 cm3 of hydrogen gas at room temperature and pressure?