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Abc > 123 > Flashcards

123 Flashcards

1
Q

What is the definition of a mole in chemistry?

A

A mole is the amount of substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.

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2
Q

How many atoms are in one mole of a substance?

A

Avogadro’s number, which is approximately 6.022 x 10^23 atoms.

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3
Q

What is the molar mass of a substance?

A

The mass of one mole of a substance, expressed in grams per mole.

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4
Q

What is the formula to calculate the number of moles in a given mass of a substance?

A

Number of moles = Mass of substance / Molar mass of substance

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5
Q

What is the formula to calculate the mass of a substance given the number of moles?

A

Mass = Number of moles x Molar mass of substance

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6
Q

True or False: The molar mass of a compound is the sum of the atomic masses of all the atoms in the compound.

A

True

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7
Q

What is the molarity of a solution?

A

The number of moles of solute per liter of solution.

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8
Q

What is the formula to calculate molarity?

A

Molarity = Number of moles of solute / Volume of solution in liters

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9
Q

What is the relationship between molarity, volume, and number of moles of solute in a solution?

A

Molarity = Number of moles of solute / Volume of solution in liters

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10
Q

What is the relationship between mass, molar mass, and number of moles of a substance?

A

Mass = Number of moles x Molar mass of substance

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11
Q

How many liters of a 0.5 M solution contain 1 mole of solute?

A

2 liters

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12
Q

What is the volume of 2 moles of a gas at STP?

A

44.8 liters

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13
Q

How many moles are in 36 grams of water?

A

2 moles

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14
Q

How many grams are in 0.5 moles of NaCl?

A

29.5 grams

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15
Q

What is the molar mass of H2O?

A

18 grams per mole

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16
Q

What is the molar mass of CO2?

A

44 grams per mole

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17
Q

What is the molarity of a solution containing 0.2 moles of NaCl in 500 mL of solution?

A

0.4 M

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18
Q

How many grams of sulfur are in 2 moles of sulfur?

A

64 grams

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19
Q

What is the volume of 3 moles of a gas at STP?

A

67.2 liters

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20
Q

How many molecules are in 2 moles of water?

A

1.204 x 10^24 molecules

21
Q

What is the molar mass of CaCO3?

A

100 grams per mole

22
Q

What is the mass of 0.25 moles of MgCl2?

A

29.5 grams

23
Q

What is the molarity of a solution containing 0.5 moles of KCl in 250 mL of solution?

A

2 M

24
Q

How many moles are in 72 grams of CO2?

A

1.5 moles

25
Q

What is the definition of a mole in chemistry?

A

A mole is the amount of substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.

26
Q

How many atoms are in one mole of a substance?

A

Avogadro’s number, which is approximately 6.022 x 10^23 atoms.

27
Q

What is the molar mass of a substance?

A

The mass of one mole of a substance, expressed in grams per mole.

28
Q

What is the formula to calculate the number of moles in a given mass of a substance?

A

Number of moles = Mass of substance / Molar mass of substance

29
Q

What is the formula to calculate the mass of a substance given the number of moles?

A

Mass = Number of moles x Molar mass of substance

30
Q

True or False: The molar mass of a compound is the sum of the atomic masses of all the atoms in the compound.

A

True

31
Q

What is the molarity of a solution?

A

The number of moles of solute per liter of solution.

32
Q

What is the formula to calculate molarity?

A

Molarity = Number of moles of solute / Volume of solution in liters

33
Q

What is the relationship between molarity, volume, and number of moles of solute in a solution?

A

Molarity = Number of moles of solute / Volume of solution in liters

34
Q

What is the relationship between mass, molar mass, and number of moles of a substance?

A

Mass = Number of moles x Molar mass of substance

35
Q

How many liters of a 0.5 M solution contain 1 mole of solute?

A

2 liters

36
Q

What is the volume of 2 moles of a gas at STP?

A

44.8 liters

37
Q

How many moles are in 36 grams of water?

A

2 moles

38
Q

How many grams are in 0.5 moles of NaCl?

A

29.5 grams

39
Q

What is the molar mass of H2O?

A

18 grams per mole

40
Q

What is the molar mass of CO2?

A

44 grams per mole

41
Q

What is the molarity of a solution containing 0.2 moles of NaCl in 500 mL of solution?

A

0.4 M

42
Q

How many grams of sulfur are in 2 moles of sulfur?

A

64 grams

43
Q

What is the volume of 3 moles of a gas at STP?

A

67.2 liters

44
Q

How many molecules are in 2 moles of water?

A

1.204 x 10^24 molecules

45
Q

What is the molar mass of CaCO3?

A

100 grams per mole

46
Q

What is the mass of 0.25 moles of MgCl2?

A

29.5 grams

47
Q

What is the molarity of a solution containing 0.5 moles of KCl in 250 mL of solution?

A

2 M

48
Q

How many moles are in 72 grams of CO2?

A

1.5 moles

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