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Chemistry lab: Preparation of Alum help 10 points!!?

Can somebody please solve some of the calculations for my lab? Here are some of the results from the actual experiment.Mass of weighing paper .4934 gMass of weighing paper and aluminum 1.4939 gMass of watch glass 30.9156 gMass of watch glass and dry alum 40.3578 gSo what I need to find out is the theoretical yield and the percent yield :Mass of aluminum 1.005 gMass of dry alum 9.4422 gTheoretical yield ?? gPercent yield ?? %

Answer:

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given: Mass of aluminum 1.0005 g Mass of dry alum 9.4422 g Theoretical yield ? g Percent yield ? % formula: theoreticalexp./theo x 100% percent absvalue exp.-act./actx100% step 1: plug values into eqn and solve step 2: check ans theoretical 1.0005/9.4422 x100% 10.60% percent abs value 1.0005-9.4422/9.4422 x100% 89.40% Note: typo found in mass given1.0005 instead 1.005

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