1 g of a divalent metal reacts with hydrogen to form 4.2016 g of a compound. Calculate the molecular mass of the metal.
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The formula for the compound is MCl₂, where M stands for the mystery metal, so we see that the mole ratio for the metal and chlorine is 1:2.
To find the number of moles of chlorine here, divide its mass (11.1 g - 4 g = 7.1 g) by its molar mass.
Then 4 g of “M” is 1/2 that number of moles
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