Answer : (1) The number of molecules will be, [tex]42.154\times 10^{23}[/tex]
(2) The number of moles of chlorine atoms is, 6.0112 moles
Solution :
(1) As, 1 mole [tex]H_2S[/tex] contains [tex]6.022\times 10^{23}[/tex] number of molecules
So, 7 moles [tex]H_2S[/tex] contains [tex]7\times 6.022\times 10^{23}=42.154\times 10^{23}[/tex] number of molecules
Therefore, the number of molecules will be, [tex]42.154\times 10^{23}[/tex]
(2) Number of atoms of magnesium chloride = [tex]1.81\times 10^{24}[/tex]
In one magnesium chloride molecule there are two chlorine atoms.
Number of chlorine atoms in [tex]1.81\times 10^{24}[/tex] atoms of magnesium chloride = [tex]2\times 1.81\times 10^{24}=3.62\times 10^{24}[/tex]
1 mole = [tex]6.022\times 10^{23}[/tex] atoms
Moles of chlorine = [tex]\frac{3.62\times 10^{24}}{6.022\times 10^{23}}=6.0112moles[/tex]
Therefore, the number of moles of chlorine atoms is, 6.0112 moles
