Question

Define one mole of a substance? Who introduced this term? Calculate the

number of moles in the following.

(i) 480 g of ozone

(ii) 12.044 x 1025 atoms of nitrogen



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Answer 1

Answer:

A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Wilhelm Ostwald (1853-1932) introduced the “Mol” (mole in German), probably in 1893

Explanation:

10 moles

so 480 g of ozone contains 10 moles of ozone.

Answer 2

Answer:

ANSWER

Moles of H

2

SO

4

= Molarity of H

2

SO

4

× Volume of solution (L)

=0.02×0.1

=2×10

−3

moles

No. of H

2

SO

4

molecules =2×10

−3

×6.022×10

23

=12.044×10

20

molecules

Therefore, the correct option is A.

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