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1. Some basic concepts of chemistry question bank (Chemistry)

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Q1.

What is the number of hydrogen molecules needed to synthesize $3.4 \text{ g}$ of ammonia by reaction with nitrogen?

(A)
$0.06 \times 10^{23}$
(B)
$0.12 \times 10^{23}$
(C)
$0.06 \times 10^{24}$
(D)
$0.12 \times 10^{24}$
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Q2.

What is the percentage atom economy when the formula weight of the desired product is $65 \text{ u}$ and the sum of the formula weights of all reactants is $130 \text{ u}$ (in $\%$)?

(A)
$65$
(B)
$70$
(C)
$40$
(D)
$50$
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