Question

calculate number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas

Answer 1

Answer:

2.9×10 ^-19

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Answer 2

Step 1: Given data

Number of moles of $Cl_{2}$ gas$=0.25 mol$

Number of $Cl_{2}$ molecules$=?$

Number of $Cl$ atoms$=?$

Step 2: Calculating the number of  $Cl_{2}$ molecules

Number of  $Cl_{2}$ molecules$=N_{A}\times$ Number of moles of $Cl_{2}$

Number of  $Cl_{2}$ molecules is calculated as,

$6.022\times 10^{23} \times 0.25=1.5055\times 10^{23} \ molecules$

Step 3: Calculating the number of $Cl$ atoms

Since, $1$ molecule of $Cl_{2}$ has $2Cl$ atoms,

Thus, $1.5055\times 10^{23} \ molecules$ of $Cl_{2}$ will have,

$1.5055\times 10^{23}\times 2=3.011\times 10^{23}\ atoms$

Hence, the number of  $Cl_{2}$ molecules and the number of $Cl$ atoms is $1.5055\times 10^{23} \ molecules$ and $3.011\times 10^{23}\ atoms$ respectively.

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