Which statement best describes how the periodic table has benefited society and scientists?
a. It has evolved as new information about the elements has been discovered.
b. It includes a lot of detailed information about the elements in a small space.
c. It allows people all over the world to share the same information about the elements.
d. It classifies elements into rows and columns according to their shared characteristics

more info ? ? i don't understand what the question is

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"