Is H20 a balanced equation?

However, there are two O atoms on the left side and there is only one on the right side, which needs to be balanced. To make two O atoms on the right side, you need to add 2 in front of H2O as a prefix.

no it's not

Explanation:

because H2+O2=H2O

so the balanced form is

H2 +O2=2H2O

"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"