Question

determining molar mass
use the periodic table to calculate the molar mass of each of the following compounds. each answer must have 2 decimal places.
ammonia (nh₃):
17.04 g/mol
magnesium hydroxide (mg(oh)₂):
g/mol
iron(iii) oxide (fe₂o₃):
159.70 g/mol

Explanation:

Step1: Identify atomic masses

From periodic table: Mg = 24.31 g/mol, O = 16.00 g/mol, H = 1.01 g/mol.

Step2: Calculate for each atom

In \( \text{Mg(OH)}_2 \): 1 Mg, 2 O, 2 H.
Mg: \( 1 \times 24.31 = 24.31 \)
O: \( 2 \times 16.00 = 32.00 \)
H: \( 2 \times 1.01 = 2.02 \)

Step3: Sum the masses

Molar mass = \( 24.31 + 32.00 + 2.02 = 58.33 \)

Answer:

58.33