Molar Volume Calculations
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The density of oxygen gas at 50°C and 1 atm pressure was found to be 1.2gl-1. What is
the molar volume in litres at these conditions?
2NO(g) + O2(g) → 2NO2(g) How many litres of dinitrogen dioxide could be obtained by
mixing 1.5 litres of nitrogen monoxide and 0.5 litres of oxygen?
Using the density in the data book how many moles of chlorine molecules are there
in a 2 litre container?
(Eq’n for Q’s 4 and 5) 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(l)
In experiment 0.1 moles of sodium hydrogencarbonate was heated until no further
change took place. What was the volume of gas obtained after cooling to room
temperature.(molar volume 24litres)
What was the mass of remaining solid? (i.e. mass of sodium carbonate)
The equation for the complete combustion of ethene is
C2H4(g) + 3O2(g) →2CO2(g) + 2H2O(g)
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50cm of ethene is mixed with 200 cm3 of oxygen and the mixture ignited. What is
the volume of the resulting gas mixture?
(Eq’n for Q’s 7 and 8) H2(g) + I2(g) → 2HI(g)
1.2 mol of hydrogen gas and 1.0 mol of iodine gas were mixed and allowed to react.
After 5 minutes, 0.6 mol of iodine remained.
7. How many moles of hydrogen remained at this time?
8. How many moles of hydrogen iodide were produced after 5 mins?
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9. A mixture of 20cm of methane and 30cm of oxygen were ignited at 130°C. Which
reactant was in excess and by how much? (hint balanced eq’n needed) (b) What volume of
water vapour was produced?
10. Calculate the volume of carbon dioxide released when 0.4g of calcium carbonate is
dissolved in excess hydrochloric acid. (molar Volume 24 l) (Hint: you need a balanced
equation.)
The molar volume at room temperature and pressure is 24l. What is the volume of
0.125 mol of hydrogen? (b) How many moles of oxygen gas are in 560cm3 in these
conditions?
12. Calculate the molar volume of oxygen using the following data:
11.
Mass of empty flask: = 205.42 g
Mass of flask + oxygen: = 206.70g
Volume of flask:
= 960cm3
13.
What is the volume of oxygen required for the complete combustion of 200cm3
butane? (b)What will be the volume of each product?