Q.

The number of oxygen molecules present in 100 grams of limestone is

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answer is 3.

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Detailed Solution

Lime stone is CaCO3GFW of CaCO3 = 100g100g of CaCO3 contain 3gram atoms of Oxygen100g of CaCO3 contain 1.5moles of Oxygen molecule100g of CaCO3 contain 1.5 NA molecules of Oxygen molecule
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The number of oxygen molecules present in 100 grams of limestone is