Free Printable Mol, M, Dilutions, Stoich & Lim/Excess Calculations

1.

When determining significant figures if there IS a decimal in a number (ex 0.0020) you should “read it _____________”

a)

backwards

b)

forwards

c)

either backwards or forwards

2.

When multiplying and dividing numbers you should round according to the number that has the

a)

most significant figures

b)

least significant figures

c)

most decimal places

d)

least decimal places

3.

Rounded to 3 sig figs the number 6756 would be written as

a)

7000

b)

6800

c)

6760

d)

6750

4.

Rounded to 2 sig figs the number 0.265 would be

a)

0.265

b)

0.2

c)

0.26

d)

0.27

5.

The mass for 4 mol of H₂O is

a)

18.0148 g

b)

18.0148 g/mol

c)

72.0592 g

d)

72.0592 g/mol

6.

The units for molarity are:

a)

L

b)

mol

c)

mol/L

d)

L/mol

7.

675 mL is equivalent to how many litres (L)?

a)

6.75

b)

67.5

c)

675

d)

0.675

8.

When doing dilution calculations, the solution that you start with that is going to be diluted is called the ______________ solution

a)

dilution

b)

molarity

c)

stock

d)

final

9.

$C_2H_4\ \ +\ \ 3O_2\ \ \rightarrow\ \ 2CO_2+2H_2O$
If you had 2.50 mol of $O_2$ , what two conversion factors should you use to find out g of $H_2O$ produced?

a)

$\frac{3\ mol\ O_2}{2\ mol\ H_2O}x\ \frac{31.998\ g\ O_2}{1\ mol\ O_2\ }$

b)

$\frac{31.998\ g\ O_2}{1\ mol\ O_2\ }x\ \frac{\ 3\ mol\ O_2}{2\ mol\ H_2O\ }$

c)

$\frac{2\ mol\ H_2O\ }{3\ mol\ O_2\ }x\ \frac{\ 18.0148\ g\ H_2O}{1\ mol\ H_2O}$

d)

$\frac{18.0148\ g\ H_2O}{1\ mol\ H_2O\ }x\ \frac{\ 2\ mol\ H_2O}{3\ mol\ O_2\ }$

10.

$C_2H_4\ \ +\ \ 3O_2\ \ \rightarrow\ \ 2CO_2+2H_2O$
If you had 2.50 mol of $O_2$ which conversion factor would you use to figure out the g of $H_2O$ ?

a)

$\frac{31.998\ g\ O_2}{1\ mol\ O_2}$

b)

$\frac{2\ mol\ H_2O}{3\ mol\ O_2}$

c)

$\ \frac{18.0148\ g\ H_2O}{2\ mol\ H_2O}$

d)

$\frac{18.0148\ g\ H_2O}{1\ molH_2O}$

11.

If you had 28.2 L O₂ gas, how many moles would be produced?

a)

0.88

b)

631

c)

2.52

d)

1.26

12.

If you have 257.1 g of NaNO₃ (molar mass 84.9947 g/mol) how many particles is this?

a)

1.821 x 10⁴⁷ particles

b)

1.821 x 10²⁴ particles

c)

18.21 particles

d)

3.02 particles

13.

You will use the ham sandwich reaction given for 3 questions:

4 B + 2 H + 1L + 3M --> 1HS

If you had 6 slices of bread and 10 slices of ham, which reactant is limiting?

a)

bread

b)

ham

c)

lettuce

d)

mustard

14.

You will use the ham sandwich reaction given for 3 questions:

4 B + 2 H + 1L + 3M --> 1HS

If you had 6 slices of bread and 10 slices of ham, which reactant is in excess and by how much?

a)

bread, 2 slices

b)

bread, 1.5 slice

c)

ham, 8 slices

d)

ham, 7 slices

15.

You will use the ham sandwich reaction given for 3 questions:

4 B + 2 H + 1L + 3M --> 1HS

If you had 6 slices of bread and 10 slices of ham, how many ham sandwiches can you make?

a)

5 HS

b)

10 HS

c)

1 HS

d)

1.5 HS

16.

When determining significant figures if there IS NOT a decimal in a number (ex 200) you should “read it _____________”

a)

backwards

b)

forwards

c)

either backwards or forwards

17.

Which has more molecules?

a)

1 mole H₂O

b)

1 mole Al(OH)₃

c)

1 mole NaCl

d)

There are all the same

18.

How many steps is a mol A to mol B calculation?

a)

1

b)

2

c)

3

d)

4

19.

How many steps is a mol A to mass B calculation?

a)

1

b)

2

c)

3

d)

4

20.

Mole ratios are obtained from the

a)

balanced chemical equation

b)

periodic table

c)

molar mass

21.

How do we get particles from moles?

a)

use avogadro's number

b)

use molar mass

c)

use volume of a gas

d)

use mole ratio

22.

Every stoichiometric calculation uses a balanced chemical equation.

a)

Never

b)

Sometimes

c)

True

d)

False

23.

What is the molarity of 3 mole of hydrochloric acid in 3 L of water.

a)

3

b)

1

c)

6

d)

9

24.

If you have 0.045 L of 0.465 M potassium bromide. How many moles of potassium bromide are present?

a)

20.9 mol

b)

0.021 mol

c)

0.02 mol

d)

0.0209 mol

25.

You have a 0.5 M MgSO₄ stock solution available. Calculate the volume of the stock solution needed to make 2.0 L of 0.20 MgSO₄.

a)

0.8 L

b)

5 L

c)

0.1 L

d)

0.5 L

26.

What does it mean to dilute a solution?

a)

lower the concentration of solute per solvent

b)

increase the concentration of solute per solvent

27.

What would the molarity of a solution be if you took 10 mL of a 13M stock solution and made a 300 mL solution?

a)

390M

b)

230M

c)

0.43M

d)

0.26M

Mol, M, Dilutions, Stoich & Lim/Excess Calculations

Total questions: 27

Worksheet time: 1hrs 21mins

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