Some Basic Concepts Of Chemistry Question 267
Question: $ 1.5 $ mol of $ O _2 $ combine with $ Mg $ to form oxide $ MgO $ . The mass of $ Mg $ (at. mass 24) that has combined is [KCET 2001]
Options:
A) $ 72\ g $
B) $ 36\ g $
C) $ 48\ g $
D) $ 24\ g $
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Answer:
Correct Answer: A
Solution:
$ \underset{1mole}{\mathop{Mg}},+\underset{0.5mole}{\mathop{\frac{1}{2}O _2}},\to MgO $
0.5 mole of oxygen react with 1 mole of Mg 1.5 mole of oxygen react with $ \frac{1.5}{0.5}=3 $ mole $ 24\times 3=72gm $ .
