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Consider the following intermediate chemical equations:
[tex]$
\begin{array}{l}
2 H_2(g) + O_2(g) \rightarrow 2 H_2O(l) \\
H_2(g) + F_2(g) \rightarrow 2 HF(g)
\end{array}
$[/tex]

In the final chemical equation, HF and [tex][tex]\(O_2\)[/tex][/tex] are the products formed through the reaction between [tex][tex][tex]\(H_2O\)[/tex][/tex][/tex] and [tex]\(F_2\)[/tex]. Before you can add these intermediate chemical equations, you need to alter them by:

A. Multiplying the second equation by 2 and reversing the first equation.
B. Multiplying the first equation by 2 and reversing it.
C. Multiplying the second equation by 2 and reversing it.