hat is the Avogardros number? calculate the number of atom in 9.2g of Na (A tomic mass of Na =23 a.m.u)
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no. of atom = given mass/molar mass× avogadro number
no. of atom= 9.2/ 23 × 6.022×10^23
= 0.4 × 6.022
= 2.488×10^23
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