Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.

To calculate the number of molecules of sulfur (S8) present in 16 grams of solid sulfur, we need to follow these steps:

Step 1: Find molar mass of sulfur (S8)

• The atomic mass of sulfur (S) is approximately 32.06 g/mol.
• Since each S8 molecule contains 8 sulfur atoms, the molar mass of S8 is:

Molar mass of S8= 8×32.06 g/mol=256.48 g/mol

Step 2: Number of moles of S8 in 16 grams:

• The number of moles (n) is given by the formula:
• 
• For 16 grams of S8: 16/256.48 g/mol = 0.0624 moles

Step 3: Calculate the number of molecules using Avogadro’s number:

• Avogadro’s number (NA​) is 6.022×10²³ molecules/mole
• The number of molecules (N) is given by: N=n×NAN
• ​Substituting the values: N=0.0624 moles×6.022×10²³ molecules/mole ≈ 3.76×10²² molecules

Therefore, the number of molecules of sulfur (S8) present in 16 grams of solid sulfur is approximately 3.76×10²² molecules

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