How are metallic bonds different from ionic and covalent bonds?

The answer to your question is below.

Explanation:

Metallic bonds have the characteristic of being formed by metals and the electrons move freely through the atoms.

Ionic bonds are composed of a metal and a nonmetal in these kinds of bonds metals lose electrons and nonmetals gain them. Also, electronegativity is higher than 1.7.

Covalent bonds are composed of two nonmetals and elements share electrons to be stable. The electronegativity is between 0 and 1.7.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"