When finding molar mass of a compound what
two pieces of information are needed?
atomic mass and the number of each element
atomic number and number of each element
atomic mass of each element and the number of
protons

We require the information related to atomic mass of the compound and the number of each element present in the compound.

Option A

Explanation:

Molar mass is the amount of any compound present in a given sample. So we can determine the molar mass of any compound by the ratio of atomic mass of the compound to the amount of compound or element present in the sample.

So it can be defined as the mass of the compound in a given sample with respect to the number of elements present in that sample. Thus, we require the information related to atomic mass of the compound and the number of each element present in the compound.