I have a few questions on some practice problems I am doingthat are stumping me.

Question

I have a few questions on some practice problems I am doingthat are stumping me. They are all along the same line, which isfinding the identity of an element from eithre mass of given molesof the compound of percent comp of the known element. Could someonepoint me in the right direction? Here is an example of each: An ionic compound has the formula MCl2. Themass of .3011 mol of the compound is 62.69g, what is the identityof the metal M? a) Ni b) Cu c) Sn d) Hg e) Ba A metal forms a compound with the formula MCl4. Ifthe compound is 74.74% chlorine, what is the identity of the metalM? a) Na b) Co c) Ti d) Po e) Br Any help in the right direction would be appreciated. I justwant to know how to go about solving these kind of problems. I have a few questions on some practice problems I am doingthat are stumping me. They are all along the same line, which isfinding the identity of an element from eithre mass of given molesof the compound of percent comp of the known element. Could someonepoint me in the right direction? Here is an example of each: An ionic compound has the formula MCl2. Themass of .3011 mol of the compound is 62.69g, what is the identityof the metal M? a) Ni b) Cu c) Sn d) Hg e) Ba A metal forms a compound with the formula MCl4. Ifthe compound is 74.74% chlorine, what is the identity of the metalM? a) Na b) Co c) Ti d) Po e) Br Any help in the right direction would be appreciated. I justwant to know how to go about solving these kind of problems.

Explanation / Answer

We Know that :     The given formula of the compound is:         MCl2      number of moles = 0.3011         weight of thecompound = 62.69 g       Molecular weight of thecompound = 62.69 g / 0.3011 mole                                                             = 208.20 g / mol            M + 2 ( 35.5 ) = 208.20             M = 137.20 g / mol    The weight of themetal resembles to Ba from the given option      2.                   weight % = weight of the element / Total weightof the compound *100                     74.74   = 4 ( 35.5 ) / M + 4 ( 35.5) * 100                     M = 47.99 g / mol         The weight of themetal corresponds to Ti from the given option

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