LAB 1 Molecular Weight Determined by Vapor Method pdf.pdf

Iron iii oxide fe 2 o 3 1 determine the correct

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iron (III) oxide- Fe 2 O 3 1. Determine the correct chemical names of the following species: a) CaCl 2 - calcium chloride b) KMnO 4 - potassium permanganate c) NiSO 4 . 6 H 2 O- nickel (II) sulfate hexahydrate 2. The data below were obtained from an unknown liquid following this lab procedure. Calculate the molecular weight of the unknown. 679.0 mmHg 1 atm 760 mmHg 316.3 mL 1 L 1000 mL
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Emma Quinn Chem 1120-102 Tuberty weight of flask 147.001 g wt of flask + unknown 151.034 g temperature of water bath 98.6 °C barometric pressure 681.9 mm Hg volume of flask 275.8 mL mass of condensed liquid= 151.034 g -147.001 g= 4.033 g Pressure: P= = 0.897 atm Temperature: T= 98.6 °C + 273.15 K= 371.75 K moles of substance present: molecular weight: 3. Suppose that after removing the Erlenmeyer flask from the water bath you did not allow the flask to cool completely. How would this specifically affect the calculated molecular weight of the unknown for this particular trial? The calculation used to determine the moles of the substance involves using the temperature of the room to make a precise calculation. If the Erlenmeyer flask is not allowed to cool completely and the temperature is higher than 371. 75 K then the calculation of moles would not yield accurate results. If the amount of moles is not accurate than the calculation for the molecular weight will not be accurate. Checklist of Items to Submit 679.0 mmHg 1 atm 760 mmHg
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Emma Quinn Chem 1120-102 Tuberty _______ Hard copy of lab report printed, academic integrity code signed, stapled and ready to hand in before the start of pre-lab (if required by your instructor) _______ Electronic copy with academic integrity code submitted on AsULearn before the start of pre-lab under “MW Lab Report Submission” _______ Unknown Results submitted on AsULearn before the start of pre-lab under “Unknown 1 MW by Vapor unknown submission”
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