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which of the following equations shows a chemical change?

A ) c2h5oh(l)>c2h5oh(g)
B ) c3h8+5o2>3co2+4h2o
C ) h2o(s)>h2o(g)
D ) nh3(g)>nh3(l)

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B ) c3h8+5o2>3co2+4h2o

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