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Please answer the following question with detail, The concentration of Helium in the atmosphere is 5.24...

Please answer the following question with detail,

The concentration of Helium in the atmosphere is 5.24 ppmv. Express this value in terms of the percentage of the atmosphere that consists of helium atoms, and also in terms of the number of helium atoms per cubic centimeter of air (assume STP).

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He = 5.24 ppmu e 20 un volume of atmosphere contains 5.24cm He. % He = 5.26 x 100 = 6-24x509 / 106 At stp. 22400 cm3 = tinde

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