Chapter 1 – Basic Concepts of Chemistry
Assignment 7
Q.1. How many moles of nitrogen are needed to produce 8.2 moles of ammonia by reaction with hydrogen ?
Q.2. Calculate the amount of water (g) produced by the combustion of 16 g of methane.
Q.3. How many moles of methane are required to produce 22g CO2 gas after combustion?
Q.4. Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid (HCl) according to the reaction:
MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g)
How many grams of HCl react with 5.0 g of manganese dioxide ?
Q.5. Calculate the weight of iron which will be converted into its oxide, Fe3O4, by the action of 14.4 g of steam on it.
3Fe + 4H2O → Fe3O4 + 4H2
Q.6. How many grams of chlorine are required to completely react with 0.40 g of hydrogen (H2) to yield hydrochloric acid (HCl) ? Also calculate the amount of HCl formed.
H2 + Cl2 → 2HCl
Q.7. Calculate the amount of KClO3 needed to supply sufficient oxygen for burning 112 L of CO gas at STP.
2KClO3 → 2KCl + 3O2
CO + ½O2 → CO2
Q.8. Calculate the volume of oxygen at STP that would be required to convert 5.2 L of carbon monoxide to carbon dioxide.
2CO + O2 → 2CO2
Q.9. What volume of oxygen at STP is required to have complete combustion of 200 cm3 of acetylene and what would be the volume of carbon dioxide formed?
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