Which of the following correctly represents two ions and the ionic compound that would form? A. Pb4 +, 02- ,Pb204
B. Sc3+ , S2- , Sc2S3
C. Ba2 + , 02- , BaO2
D. Ca2-,F , CazF

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.