55. The transition of electrons from higher energy levels to the n = 2 energy level results in the
emission of light from hydrogen atoms. In what
part of the spectrum is the emitted light, and
what is the name given to this transition series?

clouds form

solid ice forms on leaves.

water droplets form on grass.

"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 for sodium is 0.186

the answer for rubidium is 0.251