Amixture containing 50 mole% benzene and 50 mol% toluene exist at 1 atm and 100 c.
a. calculate the mole fraction of benzene in the liquid phase
b. calculate the mole fraction of benzene in the vapor phase
c. calculate the mole fraction of the vapor phase

Draw the lewis dot structure for each of the following polyatomic ions

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %