If HA, an acid, is 15 percent dissociated in a 2.00 molar solution, what is the Ka for the solution? A.
5.3 × 10-2
B.
6.4 × 10-3
C.
1.1 × 10-2
D.
1.2 × 10-2

the role of the microscope world in creating new materials .

1 a

2 d

3 a

4 c

explanation:

"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"