I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab.
mass of Mg: .021 g
temp: 295K
barometric pressure: 29.87 inches Hg
volume of H2 gas:
the difference between tiop water level in eudiometer = 322 mm
the difference in the top water level = 165 mm
How do I start this?
see other post
To calculate the pressure exerted by the hydrogen gas in the eudiometer, you will need to use the ideal gas law equation: PV = nRT.
Here's how to start solving this problem:
1. Convert the given barometric pressure from inches of mercury (Hg) to the SI unit of pressure, which is pascals (Pa). 1 inch Hg is equal to 3386.39 pascals. So, multiply the given barometric pressure (29.87 inches Hg) by 3386.39 to get the pressure in pascals.
2. Use the difference in the top water levels in the eudiometer to determine the volume of hydrogen gas. Subtract the height of the water column at the top from the height of the water column at the bottom to find the difference (322 mm - 165 mm = 157 mm). Convert this difference to liters by dividing by 1000 since 1 liter = 1000 cubic millimeters (mm^3).
3. Convert the mass of magnesium (0.021 g) to moles by dividing by the molar mass of magnesium, which is 24.31 g/mol.
4. Now you have all the values for the variables in the ideal gas law equation:
- P (pressure in pascals)
- V (volume in liters)
- n (number of moles)
- R (universal gas constant, which is 8.314 J/(mol·K))
- T (temperature in Kelvin)
Plug in these values and solve for P.
Remember to use the correct units in the calculations and double-check your work to ensure accuracy.