Pre-Lab Questions 1. A student following the procedures in this lab exercise col

Question

Pre-Lab Questions 1. A student following the procedures in this lab exercise collected the following data mass Mg,g initial syringe volume, ml. final syringe volume, mL barometric pressure, torr temperature, K 0.0243 1.0 26.5 754 298 IL 6.100 Calculate the value of the universal gas constant, R (R 102k) 2. What would be the volume o f hydrogen gas produced by the reaction of 0.0243 g of magnesium metal, collected at 750 torr and 298 K? Use the value of R found in question 1 3. The results of this experiment are affected by the care with which each step is completed Describe how each of the following errors would affect the calculated value of R (a) The Mg slid into the HCI in the test tube before the system was sealed off (b) The room temperature increased by 3 °C between the time that the final volume measured and the temperature was recorded (c) The MgO coating was not removed before the Mg sample was placed in the HCL (d) The test tube was filled with 4 mL of 0. 10 M HCI instead of 4 mL of 1 MHCL 121

Explanation / Answer

I am solving the Q1 as per Chegg guidelines, post multiple question to get the remaining answers

Q1)

Using ideal gas equation

PV = nRT

P = 754 torr = 754/760 atm

V = final syring - initial syringe = 26.5 - 1 = 25.5 mL = 25.5/1000

Number of moles = mass of Mg/molar mass of Mg = 0.0243/24.31 = 0.00099958864 moles

Now using the ideal gas equation

PV = nRT

754/760 * 25.5/1000 = 0.00099958864  * R * (298)

R = 0.08492

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