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Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and...

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lak-86 | Student, Undergraduate | Salutatorian

Posted June 19, 2013 at 12:35 AM via web

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Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals that 0.25 mol XCl2 has a mass of 100.0 g and 0.50 mol YCl2has a mass of 125.0 g. 

a. What are the molar masses of XCl2 and YCl2? 

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ncchemist | eNotes Employee

Posted June 19, 2013 at 12:46 AM (Answer #1)

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We can figure this out by remembering that the formula for the molar mass of a chemical compound is the mass of the substance divided by the amount of the substance.  Molar mass is given in the units g/mol (grams per mole).  Since we are given both quantities in the problem above, we simply divide to get the number.

For XCl2, we are told that 0.25 moles has a mass of 100 g.  So the molar mass is 100 g / 0.25 mol = 400 g/mol.

For YCl2, we are told that 0.5 moles has a mass of 125 g.  So the molar mass is 125 g / 0.5 mol = 250 g/mol.

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