A. give the structures and provide an acceptable name for all the isomers of molecular formula c7h9n that contain a benzene ring.
b. which one of these isomers is the strongest base?
c. which, if any, of these isomers yield an n-nitroso amine on treatment with sodium nitrite and hydrochloric acid?
d. which, if any, of these isomers undergo nitrosation of their benzene ring on treatment with sodium nitrite and hydrochloric acid?

"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.the valence of the atoms combine .

i believe the answer is three water molecules