I need help please and if you can, include the formula used, thank you! A 30.0 L container at 72.3 °C holds fluorine, chlorine, and oxygen gases. How many moles of oxygen gas are present if the container has 25.6 g F2 and 32.3 g Cl2 and a total pressure of 6.16 atm?

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges