Q24 of 55 Page 5

How many significant figures should be present in the answer of the following calculations?


The calculation of multiplication and division contains four numbers. The numbers 2.5 and 3.5 contain two significant figures.

The numbers 1.25 and 2.01 contain three significant figures. The least number of significant figures is two, hence the answer to the calculation should contain two significant figures.


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The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then

(i) which is the limiting reagent?


B. calculate the amount of C formed?


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What is the symbol for SI unit of mole? How is the mole defined?

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