UCF Balancing Equations Oxygen Coefficients and Ionic Dissolution Questions

I’m studying for my Chemistry class and don’t understand how to answer this. Can you help me study? 1- when the equation below is balanced the coefficient of oxygen gas is?__ch4 + o2 ?__co2 ___h2oe. none of the above2- how many oxygen atoms are contained in 2.0 mols of oxygen o2 gas ?a. 6.02 x 1023b. 23c. 1.204 x 1024d. 2.408 x 1024e. none of the above3- when an ionic compound dissolves in water a. the oxygen end of water molecules surround the anionsb. the hydrogen end of water molecules surround the cationsc. the oxygen end of water molecules surround the cationsd. the oxygen end of water molecules surround both the anions and the ctionse. none of the above