1- when the equation below is balanced the coefficient of oxygen gas is?

__ch4 + o2 →__co2 ___h2o

a. 0

b. 1

c. 3

e. none of the above

2- how many oxygen atoms are contained in 2.0 mols of oxygen o2 gas ?

a. 6.02 x 10²³

b. 23

c. 1.204 x 10²⁴

d. 2.408 x 10²⁴

e. none of the above

3- when an ionic compound dissolves in water

a. the oxygen end of water molecules surround the anions

b. the hydrogen end of water molecules surround the cations

c. the oxygen end of water molecules surround the cations

d. the oxygen end of water molecules surround both the anions and the ctions

e. none of the above