Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry > Moles And Amount Of Substances > Flashcards

Moles And Amount Of Substances Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

What is a mole in chemistry?

A

A mole is a unit that measures the amount of substance, defined as exactly 6.022 x 10^23 entities, such as atoms or molecules.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

True or False: The molar mass of a substance is the mass of one mole of that substance.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the formula to calculate the number of moles?

A

Number of moles = mass (g) / molar mass (g/mol)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

If you have 12 grams of carbon-12, how many moles do you have?

A

1 mole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does Avogadro’s number represent?

A

Avogadro’s number represents the number of particles in one mole of a substance, which is 6.022 x 10^23.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Fill in the blank: The molar volume of an ideal gas at standard temperature and pressure (STP) is ______ liters.

A

22.4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How many moles are in 50 grams of water (H2O)? (Molar mass of H2O = 18 g/mol)

A

2.78 moles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the relationship between moles and concentration?

A

Concentration (M) = moles of solute / volume of solution (L)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

True or False: The mass of one mole of any element is equal to its atomic mass in grams.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the molar mass of sodium chloride (NaCl)?

A

58.44 g/mol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If you have 3 moles of a substance, how many molecules do you have?

A

1.8066 x 10^24 molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the formula for calculating the number of molecules from moles?

A

Number of molecules = moles x Avogadro’s number

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Fill in the blank: The formula for converting grams to moles is ______.

A

grams / molar mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the molar mass of glucose (C6H12O6)?

A

180.18 g/mol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How do you find the number of moles in a solution with a known concentration and volume?

A

Number of moles = concentration (M) x volume (L)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

True or False: Molarity is a measure of the number of moles of solute per liter of solution.

A

True

17
Q

What is the molar mass of calcium carbonate (CaCO3)?

A

100.09 g/mol

18
Q

If you have 0.5 moles of sodium (Na), how many grams do you have? (Molar mass of Na = 22.99 g/mol)

A

11.495 g

19
Q

What is the formula to convert moles to grams?

A

grams = moles x molar mass

20
Q

Fill in the blank: The unit of molarity is ______.

A

moles per liter (mol/L)

21
Q

How many moles are in 250 mL of a 2 M NaCl solution?

A

0.5 moles

22
Q

True or False: 1 mole of any gas occupies the same volume at the same temperature and pressure.

A

True

23
Q

What is the mass of 2 moles of oxygen (O2)? (Molar mass of O2 = 32 g/mol)

A

64 grams

24
Q

What is the formula for calculating the number of grams from moles?

A

grams = moles x molar mass

25
Q

If 10 grams of a substance has a molar mass of 5 g/mol, how many moles are in the sample?

A

2 moles

26
Q

What is the molar mass of ammonia (NH3)?

A

17.03 g/mol

27
Q

Fill in the blank: The number of moles is directly proportional to the number of ______ in a sample.

A

particles

28
Q

If you have 4.5 moles of a gas, how many liters does it occupy at STP?

A

100.8 liters

29
Q

True or False: The concept of the mole is only used in chemistry.

A

False

30
Q

What is the formula used to determine the number of moles from volume and molarity?

A

moles = molarity x volume

31
Q

What is the molar mass of sulfuric acid (H2SO4)?

A

98.08 g/mol

32
Q

How many moles are in 75 grams of sodium bicarbonate (NaHCO3)? (Molar mass of NaHCO3 = 84 g/mol)

A

0.893 moles

33
Q

Fill in the blank: The number of molecules in one mole of a substance is known as ______.

A

Avogadro’s number

34
Q

If a solution contains 0.25 moles of solute in 1 liter of solution, what is its molarity?

A

0.25 M

35
Q

True or False: The molar mass of an element can be found on the periodic table.

A

True

36
Q

What is the molar mass of potassium chloride (KCl)?

A

74.55 g/mol

Chemistry (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions