Question

Question #dc377

Answer 1

There is none.

A mole ratio or molar ratio a fraction made up from the coefficients in a balanced equation. It is used to convert the number of moles of one substance to number of moles of another substance.

Therefore, you need a balanced equation involving KC₂H₃O₂ and something else. For example, in the equation

2KC₂H₃O₂ + H₂SO₄ → 2HC₂H₃O₂ + K₂SO₄

you can have the following molar ratios involving KC₂H₃O₂:

`(2 mol KC₂H₃O₂)/(1 mol H₂SO₄)`; `(2 mol KC₂H₃O₂)/(2 mol HC₂H₃O₂)`; `(2 mol KC₂H₃O₂)/(1 mol K₂SO₄)`;

`(1 mol H₂SO₄)/(2 mol KC₂H₃O₂)`; `(2 mol HC₂H₃O₂)/(2 mol KC₂H₃O₂)`; and `(2 mol K₂SO₄)/(2 mol KC₂H₃O₂)`

EXAMPLE 1:

What is the mole ratio between KC₂H₃O₂ and H₂SO₄ in the above reaction?

Answer:

The mole ratio is either `(2 mol KC₂H₃O₂)/(1 mol H₂SO₄)` or `(1 mol H₂SO₄)/(2 mol KC₂H₃O₂)`

We pick the fraction that gives us the correct units in a particular problem.

EXAMPLE 2:

Use the above equation to determine the number of moles of HC₂H₃O₂ that can be prepared using 0.24 mol KC₂H₃O₂.

Answer:

The mole ratio is either `(2 mol KC₂H₃O₂)/(2 mol HC₂H₃O₂)` or `(2 mol HC₂H₃O₂)/(2 mol KC₂H₃O₂)`.

We choose the one that makes the units cancel and give the correct units for the answer — the second one.

0.24 mol KC₂H₃O₂ × `(2 mol HC₂H₃O₂)/(2 mol KC₂H₃O₂)` = 0.24 mol HC₂H₃O₂