Can't figure out Moles of hydrogen gas produced (mol)  I've received multiple answers (i.e., 7.686 x 10-4      &      8.455 x 10-4) both of which are wrong

Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter8: Gases
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Can't figure out Moles of hydrogen gas produced (mol) 

I've received multiple answers (i.e., 7.686 x 10-4      &      8.455 x 10-4) both of which are wrong. 

PHASE 6:
A Lab Data
X
Collecting hydrogen gas over
water
Mass of magnesium (g)
0.019
Complete the following steps:
Moles of magnesium (mol)
0.00078
eudiometer
Temperature of water (°C)
25.0
Measure volume of hydrogen
Temperature of water (K)
298.15
gas. Record in Lab Data
Vapor pressure of water (mmHg)
23.8
Calculate pressure of hydrogen
gas produced in mmHg. Record
in Lab Data
5
Barometric pressure (mmHg)
776.0
19
Observations
6
Convert pressure of hydrogen
gas produced to atm. Record in
Lab Data
Volume of hydrogen gas collected (mL)
19.00
Calculate moles of hydrogen gas
Volume of hydrogen gas collected (L)
0.01900
produced. Record in Lab Data
Pressure of hydrogen gas (mmHg)
752.2
Calculate ideal gas constant, R,
in units of L-atm-mol1-K.
Record in Lab Data
Pressure of hydrogen gas (atm)
0.9897
Moles of hydrogen gas produced (mol)
E MY NOTES
A LAB DATA
O SHOW LABELS
Ideal gas constant (L-atm-mol-1-K-1)
0.082
GO TO PHASE 7
20
Transcribed Image Text:PHASE 6: A Lab Data X Collecting hydrogen gas over water Mass of magnesium (g) 0.019 Complete the following steps: Moles of magnesium (mol) 0.00078 eudiometer Temperature of water (°C) 25.0 Measure volume of hydrogen Temperature of water (K) 298.15 gas. Record in Lab Data Vapor pressure of water (mmHg) 23.8 Calculate pressure of hydrogen gas produced in mmHg. Record in Lab Data 5 Barometric pressure (mmHg) 776.0 19 Observations 6 Convert pressure of hydrogen gas produced to atm. Record in Lab Data Volume of hydrogen gas collected (mL) 19.00 Calculate moles of hydrogen gas Volume of hydrogen gas collected (L) 0.01900 produced. Record in Lab Data Pressure of hydrogen gas (mmHg) 752.2 Calculate ideal gas constant, R, in units of L-atm-mol1-K. Record in Lab Data Pressure of hydrogen gas (atm) 0.9897 Moles of hydrogen gas produced (mol) E MY NOTES A LAB DATA O SHOW LABELS Ideal gas constant (L-atm-mol-1-K-1) 0.082 GO TO PHASE 7 20
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