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Atomic Mass and Avogadro's Number Quiz

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Questions and Answers

What is the mass of 1 atom of C-12 expressed in atomic mass units (amu)?

6.022 x 10^23 amu

11.8726 amu

1.992657 x 10^-23 amu

12.00 amu (correct)

What term is used to refer to the quantity of particles of a substance that is equal to Avogadro’s number?

Formula units

Molecules

Mole (correct)

Atomic mass

Where can the atomic mass of an element be found?

Molecules

Moles

Atomic mass units

Number of protons and neutrons (correct)

What is the average atomic mass of C?

12.01173638 amu Signup and view all the answers

What is the average atomic mass of K?

39.0983 amu Signup and view all the answers

What is used to find the average mass of an element and molecules to solve stoichiometric problems?

Moles Signup and view all the answers

What is the value of Avogadro’s constant?

6.022 x 10^23 particles Signup and view all the answers

What is the formula mass of Na₃PO₄?

163.94 amu Signup and view all the answers

What is the molecular mass of carbon dioxide (CO₂)?

44.01 amu Signup and view all the answers

How many moles are there in 460.0 g of sodium?

10 moles Signup and view all the answers

How many sodium atoms are there in 460.0 g of sodium?

$1.2044 x 10^{24}$ atoms Signup and view all the answers

Determine the number of atoms and the mass of 0.85 mole of copper.

$3.4115 x 10^{23}$ atoms, 20 g Signup and view all the answers

How many grams and atoms of hydrogen are present in 65 grams of glucose (C₆H₁₂O₆)?

$3.6072 x 10^{24}$ atoms, 24 g Signup and view all the answers

What does Avogadro’s Law govern?

The relationship between the number of gas particles and the volume they occupy Signup and view all the answers

What is the simplest positive integer ratio of atoms present in a compound called?

Empirical formula Signup and view all the answers