Calculate the number of formula units of Na 2 SO 4 in 4-g millimoles of a pure sample of N a 2 SO 4-A- 24-088 - 1023B- 2-68 - 1023C- 2-41 - 1020D- 2-68 - 1020

The correct option is D 2.68 × 10^20We know, 1 mole of Na_2SO_4 = 6.022 × 10^23 formula units of Na_2SO_4. So, 1 millimole of Na_2SO_4 = 6.022 × 10^20 formula ...

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Standard XII

Chemistry

Mole Concept

Calculate the...

Question

Calculate the number of formula units of $N a_{2} S O_{4}$ in $\frac{4}{9}$ millimoles of a pure sample of $N a_{2} S O_{4}$ .

24.088 \times 10^{23}

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2.41 \times 10^{20}

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2.68 \times 10^{20}

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2.68 \times 10^{23}

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Solution

The correct option is C $2.68 \times 10^{20}$
We know,
1 mole of $N a_{2} S O_{4} = 6.022 \times 10^{23}$ formula units of $N a_{2} S O_{4}$ .

So, 1 millimole of $N a_{2} S O_{4} = 6.022 \times 10^{20}$ formula units of $N a_{2} S O_{4}$ .

Therefore, $\frac{4}{9}$ millimoles of $N a_{2} S O_{4}$
$= 6.022 \times 10^{20} \times \frac{4}{9}$ formula units
$= 2.68 \times 10^{20}$ formula units of $N a_{2} S O_{4}$

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Calculate the number of formula units of Na2SO4 in 49 millimoles of a pure sample of Na2SO4.

The correct option is C 2.68×1020We know, 1 mole of Na2SO4=6.022×1023 formula units of Na2SO4. So, 1 millimole of Na2SO4=6.022×1020 formula units of Na2SO4. Therefore, 49 millimoles of Na2SO4 =6.022×1020×49 formula units =2.68×1020 formula units of Na2SO4

Calculate the number of formula units of $N a_{2} S O_{4}$ in $\frac{4}{9}$ millimoles of a pure sample of $N a_{2} S O_{4}$ .