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If the true melting point for lauric acid is 43.2 oC what is the percent error?

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter3: Matter-properties And Changes

Section: Chapter Questions

Problem 11STP

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If the true melting point for lauric acid is 43.2 ^oC what is the percent error?

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Anna Divi, a young and ambitious researcher, is planning to put up her very own research laboratory. However, she does not have the funds for this to happen. She then approached Alan Read, CEO of a well-known funding agency, to help her pursue her dream laboratory. Before Alan considers Anna's proposal, Anna must perform an experiment on determining the melting point of solutions. She nust have an accurate result with a percent error not greater than 3%. The data on the experiment is given below. Help Anna achieve her goals by performing the necessary calculations below. Table 1. Data on the determnination of the melting point of the solution. Parameters Values Theoretical freezing point of solvent, °C 65.8 Freezing point depression constant (k 2.49 of solvent, °C m1 mass of solute, g 0.250 mass of solvent, g 2.100 molar mass of solute, g mol1 148.21
Please help with the following, make sure your asner is correct with proper signs 100%, pls and thank you
Sample Method A Si wt% Method B Si wt% 1 11.570 11.510 15.380 15.350 17.950 17.900 4. 22.840 22.820 5. 25.110 25.190 6. 27.070 27.030 Determine faale- cale =
Volatile Liquid Unknowns Liquid Molecular Formula Molar mass Boiling point ('C at 1 atm) (g/mol) Pentane CSH12 72.2 36.2 Acetone C3H6O 58.1 56.5 Methanol CH40 32.0 64.7 Hexane C6H14 86.2 69.0 Ethanol CH6O 46.1 78.5 Questions 1. Calculate the % Error in the molar mass you determined. %Error Ical. Molar mass-Theor. Molar mass! • 100 Theor. Molar mass 2. If the outside of the flask is not dried after vaporizing the liquid, will the unknown's calculated molar mass be too high or too low? Explain. m RT PV
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chips trial mass of the chip mass of the fat %by mass of fat regular 1 20.043 6.745 33.65% 2 20.187 6.438 31.89% 3 20.198 7.451 36.89% lowfat 1 19.456 3.982 20.47% 2 20.072 4.547 22.65% 3 20.192 4.589 22.73% Calculate the average % by mass of fat for each type of chip. Show your work.
there is more than one correct answer
a sample of sodium carbonate Na2CO3 is being dried. after 1 hour of drying the mass of the sample was 0.337g. after an additional 30 minutes of drying the mass of the sample is 0.333g what is the percent change between the first and second measurement? if to be considered dry two consecutive measurements must have a percent change of less than or equal to plus or minus 1% is the sample dry?
Urgently in one hour