Multiple Choice
Which of the following is the correctly balanced chemical equation for the reaction between NaBr and H3PO4 to form Na3PO4 and HBr?
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3. Chemical Reactions
Balancing Chemical Equations
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the balanced chemical equation 2Al + 6HCl → 2AlCl3 + 3H2, how many chlorine atoms are present on the products side?
A
6
B
3
C
9
D
2
Verified step by step guidance1
Identify the chemical species on the products side of the equation: 2AlCl3 and 3H2.
Focus on the compound containing chlorine atoms, which is AlCl3.
Note the subscript in AlCl3, which indicates there are 3 chlorine atoms per formula unit of AlCl3.
Since there are 2 moles of AlCl3 (as indicated by the coefficient 2), multiply the number of chlorine atoms per unit by the coefficient: \$2 \times 3$.
Calculate the total number of chlorine atoms on the products side by performing the multiplication, which gives the total chlorine atoms present.
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