Which mass of helium contains the same number of atoms as 5.0 grams of Krypton?

Question

Which mass of helium contains the same number of atoms as 5.0 grams of Krypton?
A. 0.24 grams B. 5.0 grams C.3.59 x 10^22 grams D.1.45 x 10^23 grams
* please explain how you calculated your answer . Thank you Which mass of helium contains the same number of atoms as 5.0 grams of Krypton?
A. 0.24 grams B. 5.0 grams C.3.59 x 10^22 grams D.1.45 x 10^23 grams
* please explain how you calculated your answer . Thank you
A. 0.24 grams B. 5.0 grams C.3.59 x 10^22 grams D.1.45 x 10^23 grams
* please explain how you calculated your answer . Thank you

Explanation / Answer

answer :) A. 0.24 grams

Kr mass = 5 g

Kr molar mass = 83.80 g/mol

Kr moles = mass / molar mass = 0.0597

1 mol Kr contain ------------------> 6.023 x 10^23 atoms

0.0597 mol Kr contain ------------> x moles

x = 3.59 x 10^22 atom

Kr atoms = 3.6 x 10^22 atom

He molar mass = 4 g/mol

He moles = mass / molar masss

                = 0.24 / 4

                =0.06

0.06 moles He contain atoms = 0.06 x 6.023 x 10^23 atoms

                                                = 3.6 x 10^22 atom

so answer A)

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