Question

How many moles are in 25.3 grams of SO 3?

A.
3.16
B.
0.316
C.
2 020
D.
105

Answer 1

B.) 0.316

Step-by-step explanation:

To find the moles, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.

Atomic Mass (S): 32.065 g/mol

Atomic Mass (O): 15.998 g/mol

Molar Mass (SO₃): 32.065 g/mol + 3(15.998 g/mol)

Molar Mass (SO₃): 80.059 g/mol

25.3 grams SO₃ 1 mole
------------------------- x ------------------------- = 0.316 moles SO₃
80.059 grams