Chemistry: Stoichiometry and Chemical Equations
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Questions and Answers

What is the formula to calculate the molecular mass of a compound?

  • M = sum of atomic masses (correct)
  • M = sum of atomic masses / 2
  • M = difference of atomic masses
  • M = product of atomic masses

What is the difference between molecular mass and formula mass?

  • Molecular mass is for ionic compounds, while formula mass is for covalent compounds
  • Molecular mass is for polyatomic compounds, while formula mass is for binary compounds
  • Molecular mass is for binary compounds, while formula mass is for polyatomic compounds
  • Molecular mass is for covalent compounds, while formula mass is for ionic compounds (correct)

How many significant figures are used to read masses from the periodic table in this course?

  • 5
  • 2
  • 3
  • 4 (correct)

What is the formula for tetraphosphorous trisulfide?

<p>P4S3 (D)</p> Signup and view all the answers

What is the correct order to calculate the molecular mass of a compound?

<p>Write the formula, multiply the number of atoms by the respective atomic masses, add the masses (D)</p> Signup and view all the answers

What is the molecular mass of H2O?

<p>18.02 amu (C)</p> Signup and view all the answers

What is the formula mass of the binary compound P4S3?

<p>220.09 amu (B)</p> Signup and view all the answers

What is the name of the ionic compound with the formula NaF?

<p>Sodium fluoride (C)</p> Signup and view all the answers

What is the molecular mass of the covalent compound NF3?

<p>71.01 amu (A)</p> Signup and view all the answers

What is the unit of the mole, a physical property?

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

How do you determine the formula of a binary compound?

<p>By finding the simplest whole number ratio of atoms in the compound (D)</p> Signup and view all the answers

What is the difference between a formula mass and a molecular mass?

<p>Formula mass is for ionic compounds, molecular mass is for covalent compounds (A)</p> Signup and view all the answers

From the given text, what can be inferred about the empirical formula of a compound?

<p>It gives the relative number of atoms of each element present. (A)</p> Signup and view all the answers

What is the molecular formula for hydrogen peroxide (H2O2) based on the text?

<p>H2O2 (A)</p> Signup and view all the answers

What is the mass ratio of hydrogen to oxygen in hydrogen peroxide according to the text?

<p>1:16 (C)</p> Signup and view all the answers

In the context of the text, what is the provisional formula based on?

<p>Amount of each element in moles (D)</p> Signup and view all the answers

How many steps are involved in finding the empirical formula of a compound?

<p>3 (C)</p> Signup and view all the answers

Based on the provided information, what does the molecular formula of a compound represent?

<p>The actual number of atoms of each element in a molecule (D)</p> Signup and view all the answers

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