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Question

Which of the following has the highest mass?


A
1 mole of C atoms
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B
12 mole of CH4
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C
10 ml of water
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D
3.011×1023 atoms of oxygen
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Solution

The correct option is A $$1$$ mole of C atoms
A. 1 mole of $$ C $$ atom contains the mass 12g 

B. 1 mole of $$CH_{4}$$ contains $$1 \times 12 $$(atomic weight of carbon) + $$4 \times 1  $$ (atomic weight of  hydrogen) $$ = 16 g $$ 

$$\Rightarrow$$ 1 mole of $$ CH_{4} $$ contains the mass of $$16g$$  

$$\dfrac {1}{2}$$ mole of $$CH_{4}$$ contains $$\dfrac{16}{2} = 8g $$

C. 1 ml of $$H_{2}O$$ contains 1 gram weight. 
10 ml of $$H_{2}O$$ contains 10 grams weight

D. 1 mole of oxygen has the mass of  16g. 
From Avogadro's rule, 1 mole contains $$6.0223 \times 10^{23} atoms $$

$$ \Rightarrow $$  $$6.022 \times 10^{23}$$ atoms contains the mass of 16g 

$$\dfrac{6.022 \times 10^{23} atoms }{2}$$  $$ = 3.011 \times 10^{23} $$  atoms contain $$\dfrac {16g}{2} = 8g$$ 

$$ 3.011 \times 10^{23} $$  atoms contain $$ 8g$$ 

From above options, option A contains the highest mass. 

Chemistry

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