Aliquid mixture of benzene (a) and toluene (b) is composed of na = 2 mole of benzene (a) and no = 3 mole of toluene (b). at room temperature, the vapor pressures of pure benzene and pure toluene are pa* = 103.01 torr and pb* = 32.06 torr, respectively. (a) (4 pts.) as the pressure of the liquid solution is reduced at constant room temperature, at what pressure does the first vapor form? what is the composition of the first trace of vapor formed? (b) (4 pts.) as the pressure is reduced further at constant room temperature, at what pressure does the last trace of liquid disappear? what is the composition of the last trace of liquid? assume that the liquid phase is an ideal solution and the vapor phase is an ideal gas mixture.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

there are two significant figures.