Still need a good answer heterogeneous vs homogeneous, don't copy from web pls.

homogenous is a uniform and consistent mixture ; heterogenous is a mixture that is non-uniform

Explanation:

usually if you can separate the mixture/particles it is heterogenous.  For example, pizza is heterogenous because you can separate the dough from the tomato sauce from the cheese.  vinegar is homogenous (cannot separate mixture)

"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"