Question

calculate the number of molecules of sulphur S8 present in 16 g of solid sulphur ​

Answer 1

The molecular formula of sulphur is given to be S₈ (it contains 8 atoms of sulphur). So,the molecular mass of sulphur molecules is 32 × 8 = 256 u. This means that 1 mole of sulphur molecule is equal to 256 grams.

Now,

→ 256 g of Sulphur = 1 mole of sulphur molecules

So,

→ 16 g of Sulphur = 1/256 × 16 mole of sulphur molecules

= 0.0625 mole of sulphur molecules.

Also,

→ 1 mole of sulphur molecules = 0.0623 × 10²³ molecules

So,

→ 0.0625 mole of sulphur molecules = 6.023 × 10²³ × 0.0625 molecules

= 3.76 × 10²² molecules....(Answer)

_____________________________

Atomic Masses of Some Common Elements :

• Hydrogen (H) → 1 u
• Carbon (C) → 12 u
• Nitrogen (N) → 16 u
• Oxygen (O) → 16 u
• Sodium (Na) → 23 u
• Magnesium (Mg) → 24 u
• Aluminium (Al) → 27 u
• Phosphorus (P) → 31 u
• Sulphur (S) → 32 u
• Chlorine (Cl) → 35.5 u
• Potassium (K) → 39 u
• Calcium (Ca) → 40 u
• Iron (Fe) → 56 u
• Copper (Cu) → 63.5 u

Answer 2

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The molecular formula of sulphur is given to be S₈ (it contains 8 atoms of sulphur). So,the molecular mass of sulphur molecules is 32 × 8 = 256 u. This means that 1 mole of sulphur molecule is equal to 256 grams.

Now,

→ 256 g of Sulphur = 1 mole of sulphur molecules

So,

→ 16 g of Sulphur = 1/256 × 16 mole of sulphur molecules

= 0.0625 mole of sulphur molecules.

Also,

→ 1 mole of sulphur molecules = 0.0623 × 10²³ molecules

So,

→ 0.0625 mole of sulphur molecules = 6.023 × 10²³ × 0.0625 molecules

= 3.76 × 10²² molecules....(Answer)

_____________________________

Atomic Masses of Some Common Elements :

▸Hydrogen (H) → 1 u

▸Carbon (C) → 12 u

▸Nitrogen (N) → 16 u

▸Oxygen (O) → 16 u

▸Sodium (Na) → 23 u

▸Magnesium (Mg) → 24 u

▸Aluminium (Al) → 27 u

▸Phosphorus (P) → 31 u

▸Sulphur (S) → 32 u

▸Chlorine (Cl) → 35.5 u

▸Potassium (K) → 39 u

▸Calcium (Ca) → 40 u

▸Iron (Fe) → 56 u

▸Copper (Cu) → 63.5 u

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