Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Question

T = 23

The expression you should be evaluating for the number of moles (nn) is:

n=PV/RT

Where:

  • P is in atm
  • V is in L
  • T is in K
  • R = 0.0820574 L atm / mol K

need 6 sig figs

Using Figure 1 as reference, please complete the table below. Remember that the volume of gas in your buret includes the uncalibrated volume of your buret and the volume that results from subtracting the direct volume reading from 25.00 mL. Trial # 1 2 3 V₁ (mL) 0.401989 0.401989 0.401989 Where: x(mL) 11.00 10.00 10.00 V gas = 25.00 − x +Vu Vgas = Volume of gas in the buret (mL) * = Final buret reading at the end of electrolysis time (mL) V₁ = Volume of uncalibrated region of the buret (mL) Gas constant = 0.0820574 L atm/mol K Unrounded 14.40198 15.40198 Vgas (ml) 15.40198 Rounded 14.40 15.40 15.40 Moles of H₂ evolved Unrounded 999 3 3 Rounded P 3 3 3
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Transcribed Image Text:Using Figure 1 as reference, please complete the table below. Remember that the volume of gas in your buret includes the uncalibrated volume of your buret and the volume that results from subtracting the direct volume reading from 25.00 mL. Trial # 1 2 3 V₁ (mL) 0.401989 0.401989 0.401989 Where: x(mL) 11.00 10.00 10.00 V gas = 25.00 − x +Vu Vgas = Volume of gas in the buret (mL) * = Final buret reading at the end of electrolysis time (mL) V₁ = Volume of uncalibrated region of the buret (mL) Gas constant = 0.0820574 L atm/mol K Unrounded 14.40198 15.40198 Vgas (ml) 15.40198 Rounded 14.40 15.40 15.40 Moles of H₂ evolved Unrounded 999 3 3 Rounded P 3 3 3
Temperature (°C) 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Vapor Pressure (mm Hg) 12.8 13.6 14.5 15.5 16.5 17.5 18.6 19.8 21.1 22.4 23.8 25.2 26.7 28.3 30.0 31.8
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Transcribed Image Text:Temperature (°C) 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Vapor Pressure (mm Hg) 12.8 13.6 14.5 15.5 16.5 17.5 18.6 19.8 21.1 22.4 23.8 25.2 26.7 28.3 30.0 31.8
Expert Solution
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Step 1: Given data

The temperature is T = 23 °C = (273+23) K = 296 K.

The pressure is P = 21.1 mmHg = fraction numerator 21.1 over denominator 760 end fraction atm.

The universal gas constant value is R = 0.0820574 L.atm/mol.K.

We have to calculate the number of moles of hydrogen at different volumes.

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