Answer:
the Molar masses of Z and X
Explanation:
The percent by mass of X states how many grams of X are in 100 grams of the mixture. Then, we know how many grams of X, Z (we also know its percent) and of Cl ( = 100 - X % - Z %). Taking 100 g of the mixture as a base, we have:
x grams of X
z grams of Z
y grams of Cl
With the molar masses of Z and X (and of Cl) we can transform all masses into moles and then compute the mole percent of XCl(s) and of ZCl(s) in the mixture
From the given information:
The percentage mass is given as the mass of the element which is divided by mass of compound multiplied by 100.
it is estimated using the formular:
[tex]\mathbf{percentage \ mass = \dfrac{\text{mass of element in 1 mole of compound}} { \text{mass of 1 mole of compound}} \times 100}[/tex]
From there;
The mole percentage is determined, which is the ratio of moles in a substance (element or compound) divided by the total amount of the mixture.
Using the formula:
Mole percentage = mole fraction × 100
Since the mole fraction is not given, it can be estimated as well by using the formula:
[tex]\mathbf{Mole\ fraction = \dfrac{\text{No of moles of a component} }{\text{total number of moles of the compound}}}[/tex]
Eventually; To determine the unknown number of moles, we will need the value of their respective molar masses(i.e. for X and Z) by using the formula:
[tex]\mathbf{Number \ of \ moles = \dfrac{Mass}{Molar \ Mass}}[/tex]
In conclusion, the additional information required in calculating the mole percent of XCl(s) and ZCl(s) in the mixture is the molar mass of X and Z.
Learn more about Molar mass here:
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