question archive Hypothetical Data and Molar Mass Determination In this section, data similar to what you would have collected in the experiment is presented
Hypothetical Data and Molar Mass Determination In this section, data similar to what you would have collected in the experiment is presented
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Hypothetical Data and Molar Mass Determination
In this section, data similar to what you would have collected in the experiment is presented. Use this data to calculate the molar mass of Mg. Make sure to show your work for any calculations in the space provided!
Trial 1
Trial 2
Trial 3
A Mass of Magnesium (g)
0.047 g
0.048 g
0.041 g
B Volume of Hydrogen Gas (mL)
50.7 mL
50.8 mL
43.0 mL
C Volume of Hydrogen Gas (L)
Sample Calculation for C
D Temperature of Gas (Celsius)
20.0 ?
21.0?
23.0 ?
E Temperature of Gas (Kelvin)
Sample Calculation for E
F Atmospheric Pressure (mmHg)
761.9 mm Hg
761.0 mm Hg
762.8 mm Hg
G Vapor Pressure of Water According to Temperature (mmHg)
17.5 mm Hg
18.6 mm Hg
21.1 mm Hg
H Height of Water Column (mm)
* obtained from difference in water levels
** note the units are millimeters!
114.0 mm
111.0 mm
89.9 mm
I Mercury Equivalent Height (mm Hg)
* obtained by dividing H by 13.6
Sample Calculation for I
J Pressure of Hydrogen (mm Hg)
* to calculate...
F-G-I= J
Sample calculation for J
K Pressure of Hydrogen (atm)
* convert mm Hg to atm by dividing J
by 760 mm Hg
Sample calculation for K
L Moles of Hydrogen Gas (moles)
* calculate using the equation n = PV/RT
P = K V = C T = E
R = 0.0821 (L?atm)/(mol?K)
Sample Calculation for L
M Moles of Magnesium (moles
* use stoichiometry to convert L to M
(1 mole Mg produces 1 mole H2)
Sample Calculation for M
N Calculated Molar Mass of Magnesium (g/mol)
* calculate by dividing mass of sample by moles
A ÷ M = N
Sample Calculation for N
O Average Molar Mass
* find by averaging N for all three trials
Calculation for O
P % Error
* compare average molar mass to actual molar
mass of Magnesium (24.31 g/mol)
Calculation for P
