shiwvcponya shiwvcponya

30-07-2016
Chemistry

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calculate the number of atoms in . (a) 52 moles of He. (b) 52 g of He. (c) 52 u of He

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Hussain514 Hussain514

04-08-2016

Atomic mass of Helium is 4u = 2protons + 2 Neutrons = 1 atom
No. of atoms in 52u = 52/4 = 13 atoms

52g of heliume
6.022*10^23*52/4 atoms of he
7.829*10^24 atoms of he

1mole of he =6.023*1023

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