Final answer:
The correct formula for magnesium nitrite trihydrate is d. Mg(NO₂)₂ · 3H₂O, and its molecular mass is calculated to be 170.367 amu by summing the atomic masses of magnesium, nitrogen, oxygen, and hydrogen in the compound. d.Mg(NO₂)₂ · 3H₂0
Step-by-step explanation:
The formula for magnesium nitrite trihydrate is d. Mg(NO₂)₂ · 3H₂O. To calculate the molecular (formula) mass of this compound, follow these steps:
- Multiply the atomic masses with the number of atoms in the formula.
- Add up all the atomic masses to get the total molecular mass.
Breaking it down:
- Mg: 1 x 24.305 = 24.305 amu
- N: 2 x 14.007 = 28.014 amu
- O (in NO₂): 4 x 16.00 = 64.00 amu
- H (in 3H₂O): 6 x 1.008 = 6.048 amu
- O (in 3H₂O): 3 x 16.00 = 48.00 amu
Summing these:
24.305 amu (Mg) + 28.014 amu (N) + 64.00 amu (O in NO₂) + 6.048 amu (H in 3H₂O) + 48.00 amu (O in 3H₂O) = 170.367 amu for Mg(NO₂)₂ · 3H₂O.