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A sample of oxygen gas (O2) has a volume of 7.51 L at a temperature of 19°C and a pressure of 1.38 atm. Calculate the moles of O2 molecules present in this gas sample. A. 0.217 mol B. 0.866 mol C. 6.65 mol D. 0.433 mol =n

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Answer:

The moles of O₂ which are present in the sample are 0.433. (option D)

Explanation:

We should apply the Ideal Gases Law, to solve this:

P . V = n. R. T

1.38 atm . 7.51L = n . 0.082 . 292K

(1.38 atm . 7.51L) / (0.082 . 292K) = n

0.433 moles = n

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