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Some Basic Concepts Of Chemistry

Question
CBSEENCH11008027
Wired Faculty App

How many atoms and molecules of phosphorus are present in 62 g of phosphorus (P4)?

Solution

Molecular formula of phosphorus = P4
Gram molecular mass of phosphorus (P4)
                                                       = 4 x 31 = 124 g
124 g of phosphorus contains 6.023 x 1023 molecules of phosphorus
                        therefore 62 g of phosphorus would contain
             equals space fraction numerator 6.023 space cross times space 10 to the power of 23 over denominator 124 end fraction cross times 62 space molecules space of space phosphorus equals space 3.011 space straight x space 10 to the power of 23 space molecules space of space straight P subscript 4 space space Now space 1 space mole space of space straight P subscript 4 space equals space 6.023 space cross times space 10 to the power of 23 space molecules of space straight P subscript 4 space equals space 4 space cross times 6.023 space cross times space 10 to the power of 23 space atoms space of space phosphorus space straight i. straight e. space 124 space straight g space of space phosphorus space contain space 4 space cross times space 6.023 space cross times space 10 to the power of 23 space atoms space of space phosphorus therefore space 62 space straight g space of space phosporus space contain equals space fraction numerator 4 cross times 6.023 cross times 10 to the power of 23 over denominator 124 end fraction cross times space 62 space atoms space of space phosphorus equals space 1.2046 space cross times space 10 to the power of 24 space atoms space of space phosphorus.

Some More Questions From Some Basic Concepts of Chemistry Chapter

What is the relation between temperature in Kelvin (K) and temperature on centigrade scale?

The popular unit of pressure is atmosphere, how is it related to pascal?

What are SI units of the following:

(i) Density    
(ii) Molarity          
(iii) Energy    
(iv) Temperature ?

Out of 5.00 g and 5.0 g which one is more accurate and why?

What is iodised table salt?

Under what conditions air is considered as a heterogenous mixture?

What is gun powder?

Name two elements which are liquids.

Name two elements which are gases.

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