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Predict the mass possessed by certain number of oxygen atoms which is equal to the number of molecules present 1g of hydrogen gas?

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Mass of oxygen atoms = number of molecules present 1g of hydrogen gas 

Number of molecules in 1g H2 = 1/2 mole 

⇒ 1/2×6.022 × 1023atoms 

⇒ 3.01 × 1023 

Thus, the mass possessed by certain number of oxygen atoms is 3.01 × 1023

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