Astudent obtains a mixture of the chlorides of two unknown metals, x and z. the percent by mass of x and the percent by mass of z in the mixture is known. which of the following additional information is most in calculating the mole percent of xcl(s) and of zcl(s) in the mixture?

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

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.