Multiple Choice
Which sequence of coefficients should be placed in the blanks to balance the following chemical equation? __C_2H_6 + __O_2 → __CO_2 + __H_2O
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
Consider the balanced chemical equation: PCl3 + Cl2 → PCl5. What is the mole ratio of PCl3 to PCl5 in this reaction?
A
5:3
B
2:1
C
1:1
D
3:5
Verified step by step guidance1
Identify the balanced chemical equation given: \(\mathrm{PCl_3 + Cl_2 \rightarrow PCl_5}\).
Look at the coefficients in front of each compound in the balanced equation. Here, the coefficient for \(\mathrm{PCl_3}\) is 1 and for \(\mathrm{PCl_5}\) is also 1.
The mole ratio between two substances in a balanced chemical equation is the ratio of their coefficients.
Write the mole ratio of \(\mathrm{PCl_3}\) to \(\mathrm{PCl_5}\) as \$1:1$ because both have the coefficient 1.
This means that 1 mole of \(\mathrm{PCl_3}\) reacts to form 1 mole of \(\mathrm{PCl_5}\), confirming the mole ratio is \$1:1$.
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