The empirical formula CH2 has a formula mass of 14, and 42.0/14 = 3. Therefore, the molecular formula is C3H6.
C12h24
C26h38o4
C3H6
c3h6
Nh2cl
The molecular formula of a compound can not be determined solely based on its molar mass. In this case, without additional information, it is not possible to determine the molecular formula of the compound CH2.
C6h12o6
C12h24
C26h38o4
In most cases one cannot identify a compound by its molar mass. There are too many possibillities.
c3h6-apex
C3H6
c12h24
c3h6
Nh2cl
The molecular mass of a compound with the formula CH2O is approx. 30, not 120.
It is called the molar mass of that compound. In other words, the total mass of all of the elements in a compound is equal to one mole of that compound.