How many moles is 125 g CuO2?

1.31moles

Explanation:

Given parameters:

Mass of CuO₂  = 125g

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we use the expression below:

   Number of moles  =  

Molar mass of CuO₂  = 63.6 + 2(16) = 95.6g/mol

So;

 Number of moles  =   = 1.31moles

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).