Chem 22

posted by .

3.5 cm of Mg ribbon(0.009729 g/cm0 reacts with HCL to produce 32.6 ml. of Hydrogengas at 750 mm Hg and 20 degree C. the vapor pressure of water at 20 degree C is 17.5 mm Hg. Calculate the molar volume of hydrogen (L/mole) and the percent error in your determination

• Chem 22 -

I suppose you mean the mass of Mg = 0.009729 g/cm.
Mass Mg = 0.009729g/cm x 3.5 cm = approximately 0.034g (but you can get a more accurate answer).
mols Mg = grams/molar mass = 0.034/24.3 = 0.0014 = mols H2 (from the equaton below.)

Mg + 2HCl ==> H2 + MgCl2

32.6 mL wet H2 gas at the conditions listed. Convert this to STP for DRY H2 gas. Use (P1V1/T1) = (P2V2/T2)
P1 = 750-17.5 = ?mm
V1 = 32.6 mL
T1 = 273+20 = ?
P2 = 760 mm
V2 = ?
T2 = 273
I get V2 = approximately 30 mL and that is for 0.0014 mol.
For 1 mol that will be 30/0.0014 = about 20,000 mL/mol. The recognized molar volume is 22,400 mL/mol. Your experimental error is
[(20,000 - 22,400)/(22,400)]*100 = about 6%

Similar Questions

1. chem 3A

please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems. 1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical equation …
2. chemistry

what is the partial pressure of 02 collected over water at 25 degree C and 630 torr (vapor pressure of H20 at 25 degree C is 23.8 torr)
3. Chemistry

A sample of oxygen gas is collected by displacing water from an inverted bottle as shown in the diagram below. The volume of O2(g) collected is 400.0ml at 25 degree Celsius. The atmospheric pressure is 680 torr and the vapor pressure …
4. General Chemistry

A 0.1358g zinc metal reacts completely with Dil HCL to produce 52.20ml of H2(g) at 22.0 degrees Celsius. The hydrogen gas is collected over water at 22.0 degree Celsius and a barometric pressure of 755 mm Hg. The water vapor pressure …
5. Chemistry

What is the equilibrium partial pressure of water vapor above a mixture of 37.5 g H2O and 62.5 g HOCH2CH2OH at 55 degree C. The partial pressure of water at 55 degree C is 118.0 mm Hg. Assume ideal behavior for the solution.
6. Chem 22

3.5 cm of Mg ribbon(0.009729 g/cm0 reacts with HCL to produce 32.6 ml. of Hydrogengas at 750 mm Hg and 20 degree C. the vapor pressure of water at 20 degree C is 17.5 mm Hg. Calculate the molar volume of hydrogen (L/mole) and the percent …
7. Chem

Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) An experiment is performed to determine the volume of hydrogen gas produced when calcium reacts with excess HCl(aq) as represented by the net ionic equation above. A 0.0720 g sample of pure …
8. College Chem

Oxygen gas has a Henry's law constant of 1.66*10^-6 M/mm Hg at 40 degree C when dissolving in water. If the total pressure of gass (O2 gas plus water vapor) over water is 1.0 atm, what is the concentration of O2 in the water in …
9. chemistry

calculate the vapor pressure of a solution 0.53 mol of cholestrol in 4.1 molof toluene at 32 degree C. pure toluene has a vapor pressure of 41 torr at 32 degree C
10. chemistry

50cm3 of hydrogen is collected over water at 17 degree celsius and 750 mm Hg pressure.Calculate the volume of dry gas at S.T.P.The water vapour pressure at 17 degree celsius is 14 mm Hg?

More Similar Questions