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2.13 M solution means 2.13 moles of KBr per liter of water. also, 670 grams of water is 0.670 liters so you multiply the two numbers to get the moles of KBr needed 2.13 M x 0.670 L = 1.4271 moles KBr then times by molar mass 1.4271 x (80g/mol + 39g/mol_ = 169.8 grams so you need 169.8...

the numbers are not exact masses but rather the weighted average of the total possible masses of that element. for example, hydrogen can come in three types: atoms with mass 1amu, 2amu, or 3amu. but since more than 99% of all hydrogen atoms have a mass of 1amu, the value given for the mass of...

whatever you do, don't keep going back to help them. they ahve to learn that whining won't get them anything. for my dog, we just ignored him when he whined. nowadays he knows that we'll be around if he really needs anything.