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What is the mass of 3.011 x 10^22 molecules of NH3?

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What is the mass of 3.011 x 1022 molecules of NH3? 

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No. of moles of NH3 = 3.011 x 1022 / 6.022 x 1023 = 0.05 

Mass of 1 mole NH3 = 17 g 

∴ Mass of 3.011 x 1022 molecules = 17 x 0.05 = 0.85 g

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