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

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