ANSWER
The volume of oxygen gas is 0.062272L
STEP-BY-STEP EXPLANATION:
Given information
[tex]\text{The number of moles of oxygen gas = 2.78 }\times10^{-3}\text{ moles}[/tex]
Recall that, at ST, 1 mole is equivalent to 22.4L
Let x represents the volume of oxygen
[tex]\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4L} \\ 2.78\text{ }\times10^{-3}\text{ }\rightarrow\text{ xL} \\ \text{cross multiply} \\ 1\text{ }\times\text{ x = 22.4 }\times\text{ 2.78 }\times10^{-3} \\ x\text{ = 62.272 }\times10^{-3} \\ x\text{ = 6.2272 }\times10^{-2}L \end{gathered}[/tex][tex]\text{Therefore, the volume of oxygen gas is 6.2272 }\times10^{-2}L[/tex]
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