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Some Basic Concepts of Chemistry

Short Answer Type

41.

The vapour density of a gas A is four times that of B. If the molecular mass of B is M what is the molecular mass of A?

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42. Give the empirical formula of benzene and glucose.

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43.

How are empricial and molecular formulae related to each other?

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44.

In a certain compound, the percentage of an element (At. mass 12) is 92.3. What is its mole ratio?

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45. Two elements A (At. wt. 75) and B (At. wt. 16) combine to give a compound having 75·8%A. Calculate the relative number of atoms present in B.

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46.

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

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47. How many kilograms of caustic potash are required to completely neutralise 5 kg of hydrochloric acid?

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48.

A substance has empirical formula CH₂O, its vapour density is 30. What is its molecular formula?

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49.

Rewrite the following equation to make it more informative as far as possible:

$MgCO subscript 3 plus 2 HCl space rightwards arrow space MgCl subscript 2 plus straight H subscript 2 straight O space plus CO subscript 2$

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50.
What is stoichiometry?

The word ‘stoichiometry’ is derived from two Greek words - stoicheion (meaning element) and metron (meaning measure). Stoichiometry, thus, deals with the calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction.

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50. What is stoichiometry?

50.
What is stoichiometry?