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Explanation :

⇒ Take 2 Kg of dry sulphur.

⇒ The specific gravity of Sulphur is 2. So, if you weigh 2 kg of Sulphur under water it would have apparent weight of 1 Kg.

⇒ All things weigh more when they burn (oxygen gets added). Sulphur has atomic mass of 32 u. If it combines with oxygen (atomic mass = 16 u) on a one-to-one basis, it will weigh 1.5 times as much. So,  2 kg will weigh 3 kg.

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