I will award full points to complete answers with work!!! Analysis of an Aluminu
ID: 814184 • Letter: I
Question
I will award full points to complete answers with work!!!
Analysis of an Aluminum-Zinc Alloy
Data:
mass of gelatin capsule: 0.115 g
mass of alloy sample plus capsule: 0.265 g
mass of empty beaker: 250.3 g
mass of beaker plus displaced water: 343.8 g
Barometric pressure: 765.0 mm Hg
temperature: 15.3 degrees Celcius
Calculations:
Mass of alloy sample: 0.150 g
Mass of displaced water: 93.5 g
A. volume of displaced water: ________mL
B. Volume of H2, (V)_________L
C. temperature of H2, (T) _________K
D. Vapor pressure of water at T, (VP H20)_______mm Hg
E. Pressure of dry H2, (P H2)_________mm Hg
F. Moles H2 from sample, (n H2) ____________moles
G. Moles H2 per gram of sample (N H2) _______moles/g
H. % Aluminum _________%
Explanation / Answer
A. volume of displaced water: ________mL
mass of displaced water = 93.5g
volume = mass/ density = 93.5g/ 1g/mL = 93.5mL
B. Volume of H2O, (V)_________L
volume = 93.5mL = 93.5mL/1000 =0.0935L
C. temperature of H2O, (T) _________K
Temperature = 15.3oC = 15.3 + 273.15 = 288.45K
D. Vapor pressure of water at T, (VP H20)_______mm Hg
PV = nRT
n = 93.5/18 = 5.2 moles
R =
T = 288.45 K
V = 0.0935L
P = nRT/V = (5.2 x 0.082 x 288.45 ) / 0.0935 = 1314.05atm = 1314.05 x 760 = 9.9E5 mmHg