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NYS Chemistry Regents Review Practice - Moles/Stoichiometry - Question 01 Print E-mail
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Practice Questions
1. Given the unbalanced equation: Al + O2 = Al2O3 When this equation is completely balanced using the smallest whole numbers, what is the sum of the coefficients?

A)    7

B)    5

C)    9

D)    4

Correct Answer: Option C - 9

 

4Al + 3O2 = 2Al2O3.

Coefficients are the numbers in front of the element symbols. Add 4 + 3 + 2 to get 9.

Hence, options A, B and D are incorrect.

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