Respuesta :
Avagadros number states that 1 mol of any substance is made of 6.022 x 10²³ units.
1 mol of Cu is made of 6.022 x 10²³ atoms of Cu.
the molar mass of Cu is - 63.5 g/mol
63.5 g of Cu is made of 6.022 x 10²³ atoms of Cu
therefore 127.08 g of Cu contains - 6.022 x 10²³ atoms / 63.5 x 127.08
number of Cu atoms - 1.20 x 10²⁴ atoms of Cu
answer is 1) 1.20 x 10²⁴ atoms
1 mol of Cu is made of 6.022 x 10²³ atoms of Cu.
the molar mass of Cu is - 63.5 g/mol
63.5 g of Cu is made of 6.022 x 10²³ atoms of Cu
therefore 127.08 g of Cu contains - 6.022 x 10²³ atoms / 63.5 x 127.08
number of Cu atoms - 1.20 x 10²⁴ atoms of Cu
answer is 1) 1.20 x 10²⁴ atoms
Answer : The number of atoms of copper are [tex]1.20\times 10^{24}[/tex]
Explanation :
First we have to calculate the moles of copper.
[tex]\text{Moles of }Cu=\frac{\text{Mass of }Cu}{\text{Molar mass of }Cu}[/tex]
Mass of Cu = 127.08 g
Molar mass of Cu = 63.5 g/mole
[tex]\text{Moles of }Cu=\frac{127.08g}{63.5g/mole}=2.00mole[/tex]
Now we have to calculate the number of atoms of copper.
As we know that, 1 mole of substance contains [tex]6.022\times 10^{23}[/tex] number of atoms.
As, 1 mole of copper contains [tex]6.022\times 10^{23}[/tex] number of copper atoms.
So, 2.00 mole of copper contains [tex]2.00\times 6.022\times 10^{23}=1.20\times 10^{24}[/tex] number of copper atoms.
Therefore, the number of atoms of copper are [tex]1.20\times 10^{24}[/tex]
