Multiple Choice
In a stoichiometry lab, you react 2.00 mol of HCl with 1.00 mol of CaCO3. According to the balanced equation CaCO3 + 2 HCl → CaCl2 + CO2 + H2O, what is the limiting reactant?
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3. Chemical Reactions
Stoichiometry
Multiple Choice
In stoichiometry, how do you determine the mole ratio between and in the balanced equation ?
A
Use the coefficients in the balanced equation; the mole ratio is .
B
Use molar masses; the mole ratio is .
C
Use the product coefficients; the mole ratio is .
D
Use the subscripts in the formulas; the mole ratio is .
Verified step by step guidance1
Identify the balanced chemical equation: \(\mathrm{N}_2 + 3\mathrm{H}_2 \rightarrow 2\mathrm{NH}_3\).
Understand that the mole ratio between reactants is given by the coefficients in the balanced equation, which represent moles of each substance involved.
Locate the coefficients for \(\mathrm{N}_2\) and \(\mathrm{H}_2\) in the balanced equation: 1 for \(\mathrm{N}_2\) and 3 for \(\mathrm{H}_2\).
Write the mole ratio as \(\frac{1\ \mathrm{mol}\ \mathrm{N}_2}{3\ \mathrm{mol}\ \mathrm{H}_2}\), which means 1 mole of nitrogen reacts with 3 moles of hydrogen.
Note that subscripts in chemical formulas indicate the number of atoms in a molecule, not the mole ratio, and molar masses are used for mass-to-mole conversions, not mole ratios directly.
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