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How and why does facilitated diffusion occur? First car with a built in weather thermometer? When 325 g Al and 812 g Cl2 react according to the following equation, how much excess reagent (in grams) is left at the end of the react? Find the unknown angle for the following right triangle: Angle A Angle B Angle C 60° ? 90? I do not understand where the negative in -sqrt x ^ 6 comes from?