U3: Moles and Molar Mass: Mastery Test

Select the correct answer. What is the molar mass, in grams, of a mole of an element equal to?

• the number of electrons in the element

• the atomic weight of the element

• the atomic number of the element

• the number of neutrons in the element

Select the correct answer. If the atomic weight of nitrogen is 14.0, what is the mass of one mole of nitrogen gas (N₂)?

• 14.0 g

• 14.0 kg

• 28.0 mg

• 28.0 g

Tags

NGSS.HS-PS1-7

Select the correct answer. If the mass of one mole of hydrogen is 1.01 grams; phosphorus, 30.97 grams; and oxygen, 16.0 grams, what is the molar mass of phosphoric acid (H₃PO₄)?

• 50.0 grams

• 66.0 grams

• 82.0 grams

• 98.0 grams

Select the correct answer. Given the atomic weights of carbon, 12.01; hydrogen, 1.01; and oxygen, 16.0, what is the molar mass of glucose (C₆H₁₂O₆)?

• 166.18 grams

• 174.12 grams

• 180.18 grams

• 250.12 grams

Select the correct answer. How many nitrogen atoms are present in calcium nitrate, Ca(NO₃)₂?

• 6

• 3

• 2

• 1

Tags

NGSS.MS-PS1-1

(a)   particles are in a mole.

• 6.02 × 10²³
• 23 × 10⁶
• 602 billion
• 6.02 × 23¹⁰

Select the correct answer. Which of these is always equal to the molar mass of any element?

• its atomic number

• its atomic weight

• its atomic formula

• its atomic structure

Match the following terms with their definitions.

• The number of protons in the nucleus of an atom.

• atomic number

• The mass of an atom of a chemical element expressed in atomic mass units.

• atomic mass

• The mass of a given molecule.

• molecular weight

• The mass, in grams, of one mole of any substance.

• molar mass

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NO₃)₂?

• 14.01 grams

• 28.02 grams

• 42.03 grams

• 84.06 grams

What do a mole of magnesium (Mg) and a mole of iron (Fe) have in common?

• their number of atoms

• their number of molecules

• their number of electrons

• their number of protons

Tags

NGSS.MS-PS1-1