Which statement about the extraction of metals is correct? * A. Aluminium is extracted from bauxite by electrolysis.
B. Aluminium is extracted from hematite by heating with carbon.
C. Iron is extracted from bauxite by heating with carbon.
D. Iron is extracted from hematite by electrolysis.

Explanation:

In this reaction, the iron(III) oxide is reduced. to iron, and the carbon is oxidised. to carbon dioxide. In the blast furnace, it is so hot that carbon monoxide can be ...

"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"

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.