Asolution of methanol and water has a mole fraction of water of 0.312 and a total vapor pressure of 21 torr at 39.9 degrees c. the vapor pressures of pure methanol and pure water at this temperature are 256 torr and 55.3 torr , respectively.
is the solution ideal?
what can you say about the relative strengths of the solute-solvent interactions compared to the solute-solute and solvent-solvent interactions?
a. the methanol-water interactions are stronger than the methanol-methanol and water-water interactions.
b. the methanol-water interactions are weaker than the methanol-methanol and water-water interactions.

answer:

shaun and sara are studying the states of matter together in science class. their teacher asks them to list the states of matter and determine in which state the particles move freely. which statement is correct?

a.  

there are two states of matter, and particles move freely in the liquid state.

b.  

there are three states of matter, and particles move freely in the gaseous state.

c.  

there are four states of matter, and particles move freely in their solid state.

d.  

there are five states of matter, and particles move freely in both their solid and gaseous states.

explanation:

  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-

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