What is the theoretical yield of the reaction of aluminum oxide when 15.0 g of aluminum reacts with excess oxygen? 4Al(s) + 3O2(g) → 2Al2O3(s) these are the options
Question 3 options:

7.50 g Al2O3

15.0 g Al2O3

28.3 g Al2O3

56.7 g Al2O3

"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"

the answer is c. nacl

a corroding iron, if that's one of your choices

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.