Question

calculate the number of molecules in 11 gram of carbon dioxide​

Answer 1

no of moles = given weight/gram molecular weight
no of moles = 11/44 = 1/4 moles

no of molecules = no of moles ×Na
= 0.25Na molecules

total no of molecules=(0.25×3)= 0.75Na molecules

Answer 2

11 gram of carbon dioxide is composed of $1.505\times 10^{23}$ molecules.

Given:

Weight of carbon dioxide = 11 g

To find:

The number of molecules in 11 gram of carbon dioxide​ = ?

Formula to be used:

• Number of moles = $\frac{Given mass}{Atomic mass}$
• Number of molecules = No. of moles × Avogadro's number

Calculation:

Atomic mass of $CO_2$ = 1 (C) + 2(O) = 1 (12) + 2 (16) = 12 + 32 = 44

Calculation of number of moles:

Number of moles = $\frac{Given mass}{Atomic mass}$

Number of moles = $\frac{11}{44} = 0.25$

Number of moles = 0.25

Calculation of number of molecules:

Number of molecules = No. of moles × Avogadro's number

Number of molecules = 0.25 × $6.022\times10^{23}$

Number of molecules = $1.505\times 10^{23}$

Conclusion:

Thus 11 g of carbon dioxide contains  $1.505\times10^{23}$ molecules.

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