Question

calculate the number of particles in each of the following a) 4g of H2 b) 36g of carbon

Answer 1

1 g of H2 contains 6.022 *10^23 molecules
4g of H2 contains 4*6.022*10^23 molecules
= 24.088*10^23 molecules
Since 1 molecule of H2 contain 2 atoms
4g of H2 contains = 48.176*10^23 atoms or 4.8176*10^24 atoms

12 g of C contains 6.022*10^23 atoms
36g of C contains 6.022*10^23 * 3 = 1.8066*10^24 atoms
Hope it helps
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