Answer
a. MgO =
Step-by-step explanation
To determine the molar mass of each of the following, we shall use the molar mass of each of the elements in the periodic table:
(H = 1.01, N = 14.01, O = 15.999, Na = 22.99, Mg = 24.31, Ca = 40.08).
a. MgO = Mg + O = 24.31 + 15.999 = 40.31 g/mol
b. NaNO₃ = Na + N + 3(O) = 22.99 + 14.01 + 3(15.999) = 85.00 g/mol
c. Ca(OH)₂ = Ca + 2(O) 2(H) = 40.08 + 2(15.999) + 2(1.01) = 74.10 g/mol