A STUDENT DRAWS A PICTURE OF PHOTOSYNTHESIS FOR A CLASS ASSIGNMENT. WHY DOES THE STUDENT USE LABELS LIKE H2O AND COZ?
a
The student used the chemical symbol to represent the elements in each molecule.
b
The student wants to use the longest way to write the names of the molecules.
с
The student included all of the chemical combinations from the periodic table in the picture.
d
The student knew the elements could not be written in any other format.

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?

What is the volume of 3.2 moles of chlorine gas (cl2) at 295 k and 1.1 atm?