The mole number of helium is 8/4=2 mol. Under same condition, the volume of gas is related to the mole number of the gas. So the mole number of chlorine is also 2 mol which is 142 g.
Subscripts cannot be changed because they are the ratio of the amount. And as we know, in a chemical equation/reaction, mass cannot be created nor destroyed. Therefore, we cannot change subscripts, however, we could change coefficients. <span />
Explanation:
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is the change in boiling point of the substance
( °
or
)</em>
is the Vant Hoff Factor which = 1 in this case ( no unit )</em>
is the mola boiling point elevation constant of X (
)</em>
is the molality of the solution which has
as the solute and
)</em>
°
and thus number of moles =
</em>
is
</em>