What is the molar mass of mg(no3)2? explain how you calculated this value.

Explanation:

Molar mass of a substance means the sum of atomic masses of each element present in the substance.

For example, in there is one magnesium atom, two nitrogen atoms and six oxygen atoms.

Therefore, molar mass of is calculated as follows.

  Molar mass = mass of Mg + mass of N atoms + mass of oxygen atoms

                      = 24.30 g/mol + (2 \times 14.00)g/mol + (6 \times 15.99)

                      = (24.30 + 28 + 95.94) g/mol

                      = 148.24 g/mol  

Thus, we can conclude that molar mass of is 148.24 g/mol.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i think its 100

i hope this !