Practice Avogadro's Law in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

Avogadro's law states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

More gas particles need more space if temperature and pressure stay the same.

Showing a random 20 of 50 problems.

Example 1

hard

A balloon at

T,P

holds

0.80\text{ mol}

gas in

19.2\text{ L}

. After leaking, it holds

14.4\text{ L}

at the same

T,P

. What fraction of moles escaped?

Example 2

hard

Why does Avogadro's law fail for real gases at very high pressure?

Example 3

medium

2SO_2 + O_2 \rightarrow 2SO_3

(all gases) at the same

T,P

, what volume of

SO_3

forms from

8\text{ L}

SO_2

(excess

O_2

Example 4

medium

0.15\text{ mol}

of gas occupies

3.6\text{ L}

. At the same

T,P

, how many moles fit in

9.6\text{ L}

Example 5

easy

Is the proportionality between

V

and

n

in Avogadro's law positive (direct) or negative (inverse)?

Example 6

easy

Is the relationship between gas volume and moles direct or inverse (at constant T and P)?

Example 7

hard

N_2 + 3H_2 \rightarrow 2NH_3

(all gases, same

T,P

), what total change in volume occurs when

10\text{ L}

N_2

reacts completely with stoichiometric

H_2

Example 8

medium

A tire holds

0.80\text{ mol}

of air in

24\text{ L}

. After pumping more air in at constant

T,P

the volume becomes

30\text{ L}

. How many moles of air are now inside?

Example 9

hard

0.50\text{ mol}

of a gas fills

11.2\text{ L}

. Are these STP conditions?

Example 10

challenge

At the same T and P, gas X occupies

V

liters for

n

moles. If both the volume is tripled and

0.6\text{ mol}

is removed, the new amount is

1.5\text{ mol}

. Find the original

n

Example 11

medium

At fixed T and P,

0.40\text{ mol}

of gas fills

9.6\text{ L}

. What volume holds

0.60\text{ mol}

at the same conditions?

Example 12

easy

At fixed

T

and

P

0.20\text{ mol}

of gas fills

4.8\text{ L}

. What volume holds

0.50\text{ mol}

at the same conditions?

Example 13

easy

Avogadro's law states that at the same temperature and pressure, equal ___ of gases contain equal numbers of particles.

Example 14

medium

A gas occupies

11.2\text{ L}

at STP. How many moles is this?

Example 15

medium

A balloon holds

0.50\text{ mol}

of air at

12\text{ L}

. If

0.30\text{ mol}

more air is added at constant

T,P

, what is the new volume?

Example 16

easy

2.0\text{ L}

flask of

H_2

and a

2.0\text{ L}

flask of

O_2

are at the same

T

and

P

. Which flask has more molecules?

Example 17

medium

At STP, what is the volume of

3.0\text{ mol}

N_2

Example 18

medium

How many liters does

0.25\text{ mol}

of any ideal gas occupy at STP?

Example 19

challenge

2CO + O_2 \rightarrow 2CO_2

30\text{ L}

CO

reacts completely with the stoichiometric

O_2

at the same T and P. What total volume of gas (CO + O2 consumed vs CO2 formed) change occurs?

Example 20

easy

0.10\text{ mol}

of He occupies

2.24\text{ L}

at some

T

and

P

. What volume does

0.30\text{ mol}

He occupy at the same conditions?

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Gas Laws Mole