Question

. Calculate number of atoms is each of
the following. (Average atomic mass :
N = 14 u, S = 32 u)
a. 0.4 mole of nitrogen
b. 1.6 g of sulfur
(Ans.: A. 2.4088 x 1023,
B.3.011 x 1022 atom )​

Answer 1

Explanation:

a.number of atom=0.4×6.022×10^23=2.4088×10^23

b.number ofmole=1.6÷32=0.05 mol

number of atom =0.05×6.022×10^23

=3.011×10^22 atom

Answer 2

Calculation of number of atoms in the given cases.

a) 0.4 mole of nitrogen

Given:

Number of moles = 0.4

To find:

Number of atoms in 0.4 moles = ?

Formula to be used:

Number of atoms = Moles × Avogadro's number

Calculation:

Number of atoms = Moles × Avogadro's number

Number of atoms = 0.4 × $6.022\times10^{23}$

Number of atoms = $2.4088\times 10^{23}$

Conclusion:

The number of atoms in 0.4 moles of nitrogen is calculated as $2.4088\times 10^{23}$.

b) 1.6 g of sulfur

Given:

Weight of sulfur = 1.6 g

To find:

Number of atoms in 1.6 g of sulfur = ?

Formula to be used:

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

Number of atoms = Moles × Avogadro's number

Calculation:

Number of moles = $\frac{Given mass}{Molar mass} = \frac{1.6}{32}= 0.05$

Number of atoms = Moles × Avogadro's number

Number of atoms = 0.05 × $6.022\times10^{23}$

Number of atoms = $0.3011\times 10^{23}$ = $3.011\times 10^{22}$

Conclusion:

The number of atoms in 1.6 g of sulfur is calculated as $3.011\times 10^{22}$.

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