Question

Calculate the gas constant, R O Convert your measured temperature to Kelvin and record it in your Notebook. Using the table found under "Resources," determine the vapor pressure of water at your measured temperature. Record the water vapor pressure in your Notebook. Calculate the pressure of hydrogen gas produced from your reaction. This will be the difference between the atmospheric pressure and the vapor pressure of water at your measured temperature. Record the hydrogen gas pressure in your Notebook. For each trial, determine the moles of hydrogen gas produced from your reaction. Record the moles of hydrogen gas in your Notebook. O For each trial, calculate with the units of L atm k'mor. Record your results in your Notebook O After calculating R for each trial, determine the average value for the gas constant, R. Record your value in your Notebook Previous lose

Answer 1

Date: Page: k Temp 20.8 293.95 Barometer (mmte 772 Pino (mmHg) 18.38 PH (mm kg) 753.62 Pre = pressure of hydrogen gas. = Ahrospheric pressure vapou presure of water Barometer pressure reading Pho 772 - 18.38 753.62 " moles of hydrogen gas produced moles of Mg where moles of Mg mass of Mg (g) molar mass of mg (g/mol) 24.305 & mass of Mg molar since, glmol. for Trials moles of Mg 6.583 x 16 164 moles 0.016 24.305 - Trial 2 moles of Mg 7.4058 x 10 moles 0.018 24.305

6.994 X10 miu Date : Page : Trial 3 moles of My 0.017 24,305 from ideal gas equ PU=HRT R = PU NT where R = Universal constant (L.atm. ) (atm) P = Pressure of gas vol of gas (2 T = Temp of gas n- no of moles of gas (in moles) For th gas Pra mm Hg 753.62 753.62 760 mmHg & atm mm Hg PH 0.9916 ahm

Date: Page: T= 293.95k Now, Calculating value of R for each Trial 6 Trial L! R = PV 3 NT 0.9916 alm 6.583x10-4 molx L X a 15,9 x 10 293.95 K R 0.08147 atml molk Trial 2: R = PV hT atm x 17.8 x 103 L 2 0.9916 7.4058 X10" mol x 293.95K 0.08108 atmL molk 0.9916 alm x 17x10 3 L 6.994x10 "mol x 293.95k Trial 3: R = PU hT 0.08199 atmil Rz molik

Date : Page: Average value of (Rt he + R/3 R 0.08147 + 0.08 108 t 0.08199 3 Rang 0.081513 alm. L. molik triali Trial 2 Trial 3 0.016 Mass of Mg (g) 0.018 6.583x10" - 7.4058810 6.994010 4 moles of H2 (= moles of Mg) 15.9 17.8 vol of H collected (mL) 0.08147 0.08108 0. 08199 Gas Constant, R (Lalo mot!) 0.08 1513 Average R (L.atm. mot 'n k)