Question

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PROP033: En of the Gul Pre-Laboratory Assignment 1. A student following the procedure described in this module collectes procedure described in this module collected the following data 0.0243 10 mass Mg 8 initial syringe volume, mL final syringe volume, ml barometric pressure, torr temperature, K Calculate the gas law constant. 26.5 754 298 answer 2. What would be the volume of hydrogen gas produced by the reaction of 0.243 g of magnesium metal and collected at 750 torr and 298 K? Use the value for R found in Pre-Laboratory Assignment 1. answer 3. The results of this experiment are greatly affected by the care with which each of the steps is completed. (1) Describe the error that would occur if the magnesium were to slide into the HCl in the test tube before the system is sealed off.

I dont know how to answer any of the question i dont know what kind of math to use

Answer 1

1. We use ideal gas equation to find the value of constant.

R = PV/nT

V = final volume - initial volume = 26.5 - 1 = 25.5 mL = 0.0255 L

P = 754 torr = 0.992 atm

Moles = mass /molar mass (of Mg) = 0.0243/24.3

R = 0.992*0.0225*24.3/0.0243*298 = 0.0749 L atm/ mol K