Calculate the number of molecules in 4.4 {\gm} of {\CO}_2 . [Atomic mass of {\C}=12, {\O}=16 ]

ICSE Class 10 Chemistry 2020 Solved Paper - Question 28

Calculate:

Question : 28 of 86

Marks: +1, -0

Calculate the number of molecules in 4.4

{\gm}

{\CO}_2

.
[Atomic mass of

{\C}=12, {\O}=16

]

Solution:

Molecular mass of

{\CO}_2

=12+16 × 2\;=44 {\gm}

\;\text " No. of Moles "\;\;=\;{\;\text " wt.ingm "\;}/{\;\text " GMM "\;}

\;=\;{4 ⋅ 4}/{44}=0.1 {\moles}

No. of molecules

\;=\;\text " Mole "\; × \;\text " Avogadros number "\;

\;=0.1 × 6.023 × 10^{23}

\;=0.6023 × 10^{23} \;\text " Molecules "\;

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