Astudent mixed two clear liquids together in a beaker.
a gas and a new liquid were formed . the gas escaped, so the student was unable to measure the mass. she guessed that its mass was more than 10.0 grams. here data is below:
liquid reactant a- 22.0
liquid reactant b- 9.0
liquid product- 17.2
gas product- ?

is the students guess about the mass of the gas correct?
a- yes, the actual mass is 4.8 g.
b- yes, the actual mass is 9.0 g.
c- no, the actual mass is 13.8 g.
d- no, the actual mass is 17.2 g.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

the correct answer would be b) volume versus temperature, because they are also directly proportional.