24 !
unstable potassium oxide reacts with water vapor in the air to produce potassium hydroxide:
k2o + h2o → koh
what, if anything, should be done to balance this chemical equation?
a. nothing. it is balanced.
b. put a "2" in front of the koh.
c. put a "4" in front of the koh.
d. put ".5" in front of both k2o and h2o.

I just took the test and the answer is B!

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