If I mix 3.0 mol of N2(g), 2.0 mol of Cl2(g), 4.0 mol of O2(g) and 1.0 mol of H2(g), what is the mole fraction of O2(g)? If the total pressure is 2.00 atm, what is the partial pressure of O2(g)?
(Hint-the answer for mole fraction of O2(g) and the answer for partial pressure of O2(g), both add to give 1.2, if we ignore units).

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.