# lab 2 - Calculations Part AClass Data Element A B C Molar...

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M calculated - M actual M actual *100% Calculations Part A- Class Data: Element A B C Molar Mass of AgX 174g/mol 242 g/mol 142g/mol Molar Mass of “X” 66.13g/mol 134.13 g/mol 34.13gmol Element “X” Bromine Iodine Chlorine Sample Calculations for Element A Mass of Precip. = 1.74g Molar Mass=(mass precip.) / (moles produces)= (1.74g)/(0.01mol)= 174. g/mol Molar Mass of Element= (molar mass) – (molar mass of Ag)= (174.g/mol)- (107.87g/mol)=66.13g/mol Own Data: Element C Mass of Precipitate=(mass of precip.+filter paper) - (mass of filter paper)= 1.61g-0.18g=1.43g Molar Mass=(mass precip.) / (moles produces)= (1.43g)/(0.01mol)= 143. g/mol Molar Mass of Element= (molar mass) – (molar mass of Ag)= (143.g/mol)- (107.87g/mol)=35.13g/mol Percent error= = 35.13 g / mol - 35.45 g / mol 35.45 g / mol *100% =0.85% error Part B- Kandimonium Jar 6- 57.14g Ratio R:S=22:13

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Isotope S R M Mass of 10 pieces 10.72g 7.62g 8.84g Mass of 1 piece 1.072g 0.762g 0.884g Amount in isotope 13 pieces 22 pieces 30 pieces Percent Abundance 0.20 0.34 0.46 Sample Calculations for M: Mass of 1 piece= (mass of 10 pieces)/10= (8.84g)/10= 0.884 g Mass M=(total mass)-(mass R+S=57.14g-(22(.762g)+13(1.072g))=26.44g Amount of M in isotope= (total mass of M) / (mass of one piece M) = 26.44g/0.884g = 30
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