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निम्नलिखित में से प्रत्येक में परमाणुओं की संख्या ज्ञात कीजिए-
`(i)52 "मोल" Ar, (ii) 52 u He, (iii) 52 g He. `

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(i ) आर्गन का 1 मोल `=6.022xx10^(23)` परमाणु
`therefore` आर्गन के 52 मोल `=52xx6.022xx10^(23)=3.131xx10^(25)` परमाणु
(ii) He के `4u=He` का एक परमाणु
`thereforeHe`के `52u=52/4=13`
(iii) He के एक मोल अर्थात इसके 4 g में `6.022xx10^(23)` परमाणु
अतएव 52 g He में उपस्थित परमाणुओं की संख्या
`=(6.022xx10^(23))/(4)xx52=3.131xx10^(25)`

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