How many atoms are in 5.00x10^-2 moles of krypton?

How many atoms are in 5.00x10^-2 moles of krypton?
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atoms are in 5.00x10^-2 moles of krypton is 1013.9558
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The noble gas used for the treatment of cancer is (1) Helium (2) Argon (3) Krypton (4) Radon

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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is (1) Xenon (2) Krypton (3) Argon (4) Helium

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