The metal in the metal hydroxide is Copper, Cu.
<h3>Further Explanation</h3>
Mass percent is the ratio of an element's mass to the mass of the compound. It is mathematically expressed as:

In the problem, the mass percent of oxygen is given as 32.8%. This can be used to determine the mass of the compound:

Now that the mass of the compound is known, the mass percent of hydrogen and of the metal, and the mass of the metal may be determined:

- Mass % of Metal, M & Mass of the Metal
![mass \% \ of \ M = \frac{mass \ of \ M}{97.561 u} \times 100\\\\\[100 - (32.8+2.05)] = \frac{mass \ of \ M}{97.561u} \times 100\\65.15 = \frac{mass \ of \ M}{97.561 u} \times 100\\0.6515 = \frac{mass \ of \ M}{97.561 u} \\mass \ of \ M \ = (0.6516)(97.561)\\\boxed {\boxed {mass \ of \ M \ = 63.56 u}}](https://tex.z-dn.net/?f=mass%20%5C%25%20%5C%20of%20%5C%20M%20%3D%20%5Cfrac%7Bmass%20%5C%20of%20%5C%20M%7D%7B97.561%20u%7D%20%5Ctimes%20100%5C%5C%5C%5C%5C%5B100%20-%20%2832.8%2B2.05%29%5D%20%3D%20%5Cfrac%7Bmass%20%5C%20of%20%5C%20M%7D%7B97.561u%7D%20%5Ctimes%20100%5C%5C65.15%20%3D%20%5Cfrac%7Bmass%20%5C%20of%20%5C%20M%7D%7B97.561%20u%7D%20%5Ctimes%20100%5C%5C0.6515%20%3D%20%5Cfrac%7Bmass%20%5C%20of%20%5C%20M%7D%7B97.561%20u%7D%20%5C%5Cmass%20%5C%20of%20%5C%20M%20%5C%20%3D%20%280.6516%29%2897.561%29%5C%5C%5Cboxed%20%7B%5Cboxed%20%7Bmass%20%5C%20of%20%5C%20M%20%5C%20%3D%2063.56%20u%7D%7D)
From the mass of the metal, its identity may be known.
Using the periodic table, search for the metal that forms a +2 cation and has a mass of 63.56 u.
The metal that fits the criteria is Copper.
<h3>LEAR MORE</h3>
Keywords: <em>mass percent</em>