Asample of a compound contains 30.0 g calcium and 5.05 g hydrogen. its molar mass is 78.12 g/mole. what is the compound’s molecular formula?

There is a fault in the question. The ratios do not add up as seen in the calculations below.

Moles of Ca 30/40.1 = 0.748 (3sf)
Moles of  H  5.05/1= 5.05

molar ratios (divide both sides by 0.748)
Ca:H
 1: 6.75 = 2:13.5 = 4:27

Therefore Ca4H27.
This gives a molar mass of 160.4+27= 187.4. Either the mass of hydrogen or the mass of calcium is wrong. 
 

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected