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There are two steps to solving this problem:
Step 1: Calculate the molar mass of KBr (molar mass is the amount, in grams, that one mole of a substance weighs).
From the Periodic Table, we see that the molar mass of K is 39.10 g/mol (its average Atomic Mass). Similarly, the molar mass of Br is 79.90 g/mol. Adding these numbers together gives the molar mass of KBr, 119 g/mol.
Step 2: Calculate the weight, in grams, using the molar mass and the number of moles.
For every one mole of KBr, you have 119 grams of KBr:
mass (m) = 119 g/mol * 3.30 mol
mass (m) = 392.7 g
Therefore, 3.30 moles of KBr weighs approximately 392.7 grams.
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