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?

<p>12.01173638 amu (D)</p> Signup and view all the answers

What is the average atomic mass of K?

<p>39.0983 amu (D)</p> Signup and view all the answers

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

<p>Moles (A)</p> Signup and view all the answers

What is the value of Avogadro’s constant?

<p>6.022 x 10^23 particles (C)</p> Signup and view all the answers

What is the formula mass of Na₃PO₄?

<p>163.94 amu (B)</p> Signup and view all the answers

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

<p>44.01 amu (A)</p> Signup and view all the answers

How many moles are there in 460.0 g of sodium?

<p>10 moles (D)</p> Signup and view all the answers

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

<p>$1.2044 x 10^{24}$ atoms (A)</p> Signup and view all the answers

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

<p>$3.4115 x 10^{23}$ atoms, 20 g (B)</p> Signup and view all the answers

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

<p>$3.6072 x 10^{24}$ atoms, 24 g (A)</p> Signup and view all the answers

What does Avogadro’s Law govern?

<p>The relationship between the number of gas particles and the volume they occupy (C)</p> Signup and view all the answers

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

<p>Empirical formula (C)</p> Signup and view all the answers

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