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Question:

Molecular Mass Help ?

Calculate (one decimal place) the molecular mass for each of the following (include units)1.) sodium chromate2.) aluminum bromate3.) manganese (III) sulfite4.) CoCl2

Answer:

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I'm not sure of the problem: No periodic table?or just don't know what molecular weight means? I don't have a periodic table eitherLet's address the second explanationMolecular mass is the sum of the atomic masses of the atoms in the moleculeThat means (in rounded numbers) the molecular mass of water is 18 g/mole - because water is H2O, 2 hydrogen atoms 1 amu each + 1 oxygen 16 amusIf you put 6.023 x 10^23 of those molecules (1 mole) together in a cup you would have 18 grams of waterSo: Write the formula, find the atomic weight of each element in the compound, add the weights of each atom togetherand that's the molecular mass - expressed as grams per mole.

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