Answer:
C) 164.1 g/mol
Explanation:
First calculate the molecular mass of Ca(NO3)2
Atomic Mass of Calcium (Ca) = 40.078 amu
Atomic Mass of Nitrogen (N) = 14.006 amu
Atomic Mass of Oxygen (N) = 15.99 amu
Where amu is Atomic Mass Unit and it is unit for atomic mass or molecular mass of an atom or molecule respectively.
Now remember to take atomic mass of Oxygen thrice because its three atoms are present and molecular mass of NO3 twice because you can see that its two molecules are attached with Calcium (Ca)
Molecular mass of Ca(NO2)3 = 40.078 + (14.006 + 15.99 x 3) x 2
= 40.078 + (14.006 + 47.97) x 2
= 40.078 + 123.95
= 164.03 amu
Now one mole can be defined as the molecular mass of a substance in grams which means molar mass of Ca(NO3)2 is 164.03 grams which is approximately eqaul to 164.1 grams.
Since it is the mass of one mole of Ca(NO3)2, it can be represented as:
164.1 g/mole
