  Question

Which of the following has the highest mass?

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

The correct option is A $$1$$ mole of C atomsA. 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 weightD. 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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