Question

calculate number of 5 atoms in 8 grams solid Sulphur.​

Answer 1

$\huge\red{Answer}$

We have to find the number of molecules present in 16g of solid sulphur.

The molecular mass of the sulphur molecule is 32 × 8 = 256 u.

1 mole of sulphur molecules is equal to 256 grams.

This means 256 g of solid sulphur contains = 6.022 x 1023 molecules.

Then, 16 g of solid sulphur contains =6.022 x 1023 / 256 = 16 molecules

= 3.76375 x 1022 molecules

Therefore, 16 g of S8 contains 3.76 x 1022 molecules.

Hope it helps ❤️

Answer 2

Explanation:

1) Number of atoms in 8 g of Sulfur:

32 g of sulfur has 6.022 × 10²³ atoms

8 g of sulfur will have x number of atoms

x = 6.022 × 10²³ × 8/32

 = 1.5 × 10²³ number of atoms

2) mass of 5 atoms in 8 g of Sulfur:

mass of a single atom = 32/ 1.5 × 10²³

                                        = 21 × 10⁻²³

For 5 atoms = 21 × 10⁻²³ × 5

                     = 106 × 10⁻²³