Question

What amount of oxygen, O2 (in moles) contains 1.8x10^22 molecules


A. 0.0030

B. 0.030

C. 0.30

D. 3.0

With explanation please

Answer 1

Answer:

b is the answer divide 1.8×10^22/6.022×10^-23

Answer 2

3.0 moles of $O_2$ contains $1.8\times 10^{22}$ molecules of oxygen

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

1 mole of oxygen $(O_2)$ contains = $6.023\times 10^{23}$ molecules of oxygen $(O_2)$

Thus $6.023\times 10^{23}$ molecules of oxygen $(O_2)$  are contained in = 1 mole of oxygen $(O_2)$

$1.8\times 10^{22}$ molecules of oxygen $(O_2)$  are contained in = $\frac{1}{6.023\times 10^{23}}\times 1.8\times 10^{22}=3.0$ moles of oxygen $(O_2)$

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