Multiple Choice
Based on the mole ratios in the balanced equation 2H2 + O2 → 2H2O, how many moles of H2O are produced when 4 moles of H2 react completely with excess O2?
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3. Chemical Reactions
Stoichiometry
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How many Br^- ions are present in 1.00 mole of FeBr_3?
A
2.00 × 6.022 × 10^{23} Br^- ions
B
3.00 × 6.022 × 10^{23} Br^- ions
C
1.00 × 6.022 × 10^{23} Br^- ions
D
6.022 × 10^{23} Br^- ions
Verified step by step guidance1
Identify the chemical formula of the compound: FeBr_3. This means one formula unit contains 1 Fe atom and 3 Br atoms (or Br^- ions).
Understand that 1 mole of FeBr_3 contains Avogadro's number (6.022 × 10^{23}) of formula units.
Since each formula unit of FeBr_3 contains 3 Br^- ions, multiply the number of formula units by 3 to find the total number of Br^- ions.
Write the expression for the total number of Br^- ions as: \$3 \times 6.022 \times 10^{23}$ ions.
Interpret this result as the number of Br^- ions present in 1 mole of FeBr_3.
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