Description 1.541 ± 0.001 g of hydrated oxalic acid crystals were dissolved in distilled water. The solution was placed in a 250.0 ± 0.5 cm3 volumetric flask and the total volume made up to the mark with distilled water. After thoroughly mixing the contents, 25.00 ± 0.04 cm3 of this solution was pipetted into a conical flask. This required 24.90 ± 0.08 cm3 of 0.100 ± 0.001 mol dm3 sodium hydroxide solution to be neutralised completely. The equation for the reaction is: (COOH)2(aq) + 2NaOH(aq) ? (COONa)2(aq) + 2H2O(l) (a) Calculatethepercentageuncertaintyassociatedwith: (i) the mass of the oxalic acid. (ii) the solution in the volumetric flask. (iii) the volume in the pipette. (iv) the molarity of the sodium hydroxide solution. (v) the volume of sodium hydroxide solution used. (b) Calculatethetotalpercentageuncertaintyforthisexperiment. (c) Calculate the molar mass of the oxalic acid obtained from these experimental results to thecorrect number of significant figures and state the uncertainty. (d) Thecorrectliteraturevalueforthemolarmassoftheacidis126.06gmol-1.Calculatethepercentage error. (e) State any other assumptions which may have affected the accuracy of the result.
Description all the directions for the lab are in the file attached please either write your answers into a document or print out the document ands end me pictures of your work whatever is easiest!
Description INVESTIGATIVE PHENOMENON What happens to gases when they are exposed to absolute zero? Absolute zero is the coldest possible temperature. Particles at room temperature move about 1,100 miles per hour (mph), depending on their molar mass. If you expose particles to super-cold temperatures (about 200 µK), they slow to about 0.45 mph. These super-low temperatures allow scientists to look at particles for extended periods to learn more about them. However, reaching absolute zero during an experiment isn't possible. And even if it were, gases don't behave "ideally" in extreme temperatures. Can our knowledge of gas laws and gas behaviors help us solve for absolute zero? In this lab activity, you will compare the volume of a contained gas at different pressures and collect data about two different gases to create a graph and solve for absolute zero. Open and complete the Ideal Gas Lab Report as you work through the steps of the virtual lab activity.
Description Hello, the following are two worksheets that need to be done, in order to get to answer them you will need to use BeyondLabz which I will help you access if you don't know how to. FOR BEYOND LABZ HEAT OF REACTION: MGO (S) + HCL (AQ) In this simulation you will use coffee cup calorimetry to measure the heat transfer that occurs when magnesium oxide reacts with hydrochloric acid. You will use your results to calculate the enthalpy of the reaction (?Hrxn) and compare it to a predicted value calculated using values for standard enthalpy of formation. FOR BEYOND LABZ HESS'S LAW In this simulation you will use coffee cup calorimetry to measure the heat of reaction (?Hrxn) for three reactions and show how they are related by Hess's Law. You have to record data for three different reactions. If you have any questions let me know!
