Consider these intermediate chemical equations. CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o g 2 cap h sub 2 cap o g rightarrow 2 cap h sub 2 cap o l Which overall chemical equation is obtained by combining these intermediate equations?
Answer
A
CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 4 cap h sub 2 cap o g plus 2 cap h sub 2 cap o l
B
CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o l
C
CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o g
D
CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 6 cap h sub 2 cap o g
Explanation
Add the two equations: the first produces 2 H₂O(g), and the second converts those 2 H₂O(g) into 2 H₂O(l). The gaseous water cancels as an intermediate, leaving CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(l). This is choice B.
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