Question

6. Rank the following compounds from smallest to largest molar mass.

Smallest = 1; Largest = 4. To earn full credit, work must be shown for all four
molar mass calculations! (11 pts)
a. SiH
b. Co
C. CH3OH
d. C₂H6
I

Answer 1

d < c < a < b

Step-by-step explanation:

The molar mass of a compound is the sum of the atomic masses of all the atoms in its chemical formula. Here are the molar masses of the four compounds you have:

a. SiH4: (1 × 28.09 g/mol) + (4 × 1.01 g/mol) = 32.13 g/mol

b. Co: 58.93 g/mol

c. CH3OH: (1 × 12.01 g/mol) + (4 × 1.01 g/mol) + (1 × 16.00 g/mol) = 32.05 g/mol

d. C2H6: (2 × 12.01 g/mol) + (6 × 1.01 g/mol) = 30.07 g/mol

So, from smallest to largest molar mass, the order is: d < c < a < b.