Question

A certain metal hydroxide, m(oh)2, contains 32.8% oxygen by mass. what is the identity of the metal m? enter the full name of the element.

Answer 1

Solution:[tex]Let the molar mass of metal M is 'a',\\ \rn(so)\\ \frac{M_{o}}{2M_{H}+2M_{o}+a}        =\frac{2.16}{2.1+2.16+a} =0.328\\ By simple algebric calculation. We get,\\         a=63.56g/mol\\ \rn(Now,)\\

We have to confirm which metal has the molar mass of 63.56g/mol. By using periodic table we have to find it the we get it is Copper(Cu).