Question

35
calculate the molecular mass о
CH3OH, CH, 4, NH3, 02
,,Cl2
​

Answer 1

Answer:

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Answer 2

Answer:

ANSWER

∠COB=90o

In △COB

∠COB+∠OBC+∠OBC=180o

∠OBC=180o−90o−40o

∠OBC=50o

∠OBC=∠ADB     ....[AD || BC]

∠ADB=50o