Question

Which among the following have highest number of molecules. (SSLC 2019) *
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Answer 1

Answer:

1 mole of any substance contains 6.02×10

23

(Avogadro's number ) of molecules.

A. 0.2 mole of H

2

contains 0.2×6.02×10

23

=1.2×10

23

molecules.

B. 8.0 mole of H

2

contains 8.0×6.02×10

23

=4.8×10

24

molecules.

C. 17 g of H

2

O =

18 g/mol

17 g

= 0.94 moles

17 g of H

2

O contains 0.94×6.02×10

23

=5.7×10

23

molecules.

D. 6.0 g of CO

2

=

44 g/mol

6.0 g

= 0.136 moles

6.0 g of CO

2

contains 0.136×6.02×10

23

=8.2×10

22

molecules.

Hence, 8.0 mole of H

2

contains the largest number of molecules

Explanation:

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