Calculate the amount of KClO3 needed to supply sufficient oxyg
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    Some Basic Concepts of Chemistry

    Multiple Choice QuestionsShort Answer Type

    191.

    How many litres of oxygen at S.T.P. will be required to burn completely 2.2 g of propane?

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    192.

    Calculate the amount of KClO3 needed to supply sufficient oxygen for burning 112L CO gas at S.T.P.

    The balanced chemical equations repersenting the reactions are:
                 
                  2CO + O2     2CO2
                      2 moles
                  (2 x 22.4L at STP)

    Stoichiometry indicates that,



    or   2 x 22.4 L  CO at S.T.P.
                        

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    193.

    How many moles of oxygen can be obtained by the decomposition of 1 mole of potassium chlorate in the following reaction:

    2 KClO subscript 3 left parenthesis straight s right parenthesis space rightwards arrow space space space 2 KCl left parenthesis straight s right parenthesis space plus 3 straight O subscript 2 left parenthesis straight g right parenthesis

    How many moles of reactants are needed for obtaining 1 mole of oxygen?

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    194.

    Gastric juice contains 3g HCl per litre. If a person produces 2.5 L of gastric juice per day, how many antacid tablets each containing 400 mg of Al(OH)3 are needed to neutralise all the HCl produced in one day?

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    Multiple Choice QuestionsLong Answer Type

    195.

    Calculate the quantity of lime required to soften 60000 litres of well water containing 16.2 g of calcium carbonate per hundred litre.

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    Multiple Choice QuestionsShort Answer Type

    196. KBr (potassium bromide) contains 32·9% by weight of potassium. If 6·40 g of bromine reacts with 3·60 g of potassium, calculate the number of moles of potassium which combines with bromine to form KBr.
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    197. Decomposition of NaHCO3 takes place at 270°C. In a sample containing Na2CO3 and NaHCO3, the heating at 270°C results in the loss of 10% by weight. What is the percentage composition of the sample?
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    198.

    How much potassium chlorate should be heated to produce 2.24 L of oxygen at NTP?

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    199.

    If ten volumes of dihydrogen gas react with five volumes of dioxygen gas, how many volumes of water vapour could be produced?

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    Multiple Choice QuestionsLong Answer Type

    200.

    What volume of oxygen at STP is required to affect complete combustion of 200 cm3 of acetylene and what would be the volume of carbondioxide formed?

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