# Gases Questions

the answer for this is on a powerpoint which i have put up if you need it.

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• Created by: Braniac
• Created on: 13-12-11 20:23

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Gases questions
In all questions assume the molar volume of a gas is 24 dm3 or 24,000 cm3.
Question 1 How many moles is:
(a) 200 cm3 of oxygen?
(b) 1,200 cm3 of carbon dioxide?
(c) 2 dm3 of sulphur dioxide?
(d) 240 dm3 of nitrogen?
(e) 23 cm3 of ammonia?
Question 2 Calculate the volume of the underlined gas in the following reactions:
(a) 2SO2(g) + O2(g) 2SO3(g) given that the volume of SO2 was 100 cm3.
(b) N2(g) + 3H2(g) 2NH3(g) given volume of H2 was 6 dm3.
(c) 2H2(g) + O2(g) 2H2O(l) given volume of H2 was 300 cm3.
(d) C2H6(g) + 3½O2(g) 2CO2(g) + 3H2O(l) given volume of ethane is 40 cm3
(e) H2O(g) + CH4(g) 3H2(g) + CO(g) given the volume of CO was 120dm3.
Question 3 Calculate the volume of gas in the following reactions:
(a) CaCO3(s) CaO(s) + CO2(g) given 22 grams of CaCO3 was used.
(b) Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) given 6 grams of Zn was used.
(c) 2Mg(s) + O2(g) 2MgO(s) given that 3.2 grams of Mg was used.
(d) Ca(OH)2(aq) + CO2(g) CaCO3(s) + H2O(l) given that 0.54 g CaCO3 was
formed.
(e) MgCO3(s) + 2HNO3(aq) Mg(NO3)2(aq) + H2O(l) + CO2(g) given that 1.03 g
of magnesium carbonate were used.
Question 4
(a) What volume of oxygen would be needed to completely combust 50 cm3 of butane
(C4H10)?
(b) What volume of chlorine would be required to react with white phosphorus to form
5 grams of phosphorus pentachloride (PCl5)?
(c) What volume of hydrogen would be formed if 2 grams of Magnesium were added
to excess sulphuric acid.
(d) Stalactites are made out of calcium carbonate formed by the decomposition of
calcium hydrogen carbonate according to the equation:
Ca(HCO3)2(aq) CaCO3(s) + H2O(l) + CO2(g)
In a 100 years, 22.78 g of calcium carbonate was deposited. What volume of
carbon dioxide was produced?
(e) Iron(III)oxide is reduced by carbon monoxide to form iron. What volume of
carbon monoxide is required to reduce 100 tonnes of the metal oxide?
Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g)
12/10/11 Gases PHB

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