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24. Intext problems: Calculation based on number of atoms/molecules II

1. Calculate the number of molecules in $11.2$ $L$ of $CO_2$ at STP.

Data:

Given volume of

$CO_2=11.2$

$L$

Molar volume of

$CO_2=$

Avogadro's number

$=6.023\times10^{x}$

$=$

Solution:

Number of moles of

$CO_2$

$=$

Number of molecules of

$CO_2$

$=$

Therefore, the number of molecules in

$11.2$

$L$ of

$CO_2$ at STP

$=$

$y\times10^{z}$

Where,

2. Calculate the number of molecules in $54$ $g$ of $H_2O$ .

Data:

Given mass of

$H_2O=54$

$g$

Gram molecular mass of

$H_2O=$

Avogadro's number

$=6.023\times10^{23}$

Solution:

Number of molecules

$=$

$\frac{x}{y}$

$=$

Therefore, the number of molecules in

$54$

$g$ of

$H_2O=18.069\times10^{z}$

$molecules$

$=$

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24. Intext problems: Calculation based on number of atoms/molecules II

Exercise condition: