Draw a graph for the radius and circumference of circle using a suitable scale. From the graph,
1. Find the circumference of the circle when radius is 42 cm.
2. At what radius will the circumference of the circle be 220 cm ?
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Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur. ∴ 16 g of sulphur = 16 256 1 16 = moles = 0.125 moles 1 mole of S8 molecules = 6.023 × 1023 number of molecules ∴ 1 16 mole of S8 = 6.023 × 1023 number of molecules × 1 16 .
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