Chemistry

posted by .

In an experiment, 238 mL of 0.45 molar hydrochloric acid completely reacts with excess iron to produce hydrogen gas and iron (III) chloride. What volume will the hydrogen gas occupy if it is collected over water at 35 degrees Celsius and 735 torr? The vapor pressure of water at 35 degrees Celsius is 42 mm Hg.

My work so far:
6HCl(aq) + 2Fe(s) ---> 3H2(g) + 2FeCl3(s)

Total pressure= Pressure of H2 + Pressure of H20
Solve for Pressure of H2:
Pressure of H2=Total pressure - Pressure of H20

Conversions:
Total Pressure= 735 torr X (1 atm/760 torr)=0.967 atm

Pressure of the water= 42mm Hg X (1atm/760 torr)=0.055atm

So...Pressure of H2= 0.967atm-0.055atm=0.912atm

I'm lost. I have no idea where to go next from here. Any help is greatly appreciated!

  • Chemistry -

    You've done the hard part.
    How much HCl did you start with? M x L = ??
    Now convert moles HCl to moles H2 gas using the coefficients in the balanced equation.
    moles HCl x (x moles H2/y moles HCl) = zz
    Then substitute for n in PV = nRT and solve for volume. Your calculation for P is correct although I think you went the long way around the barn to get there. I would have done this.
    P = 735-42 = xx mm
    Then xxmm/760 = 0.912 atm.

  • Chemistry -

    Thank you so much! I was really stuck and my brain went completely blank.

  • Chemistry -

    912 mm Hg to standard atmosphere

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    A mixture of chromium and zinc weighing .362 g was reacted with an excess of hydrochloric acid. After all the metals in the mixture reacted 225 mL of dry hydrogen gas was collected at 27 C and 750 torr. Determine the mass percent Zn …
  2. Chemistry 101

    Iron reacts with hydrochloric acid to produce iron (2) chloride and hydrogen gas.Fe (s)+ 2 HCL (aq) -FeCl2 (aq) + H2 (g).The hydrogen gas from the reaction 2.2g of iron with excess acid is collected in a 10L flask at 25 degrees celcius. …
  3. chemistry

    a chemist reacts 8.85g or iron with an excess oh hydrogen chloride to form hydrogen gas and iron(II)chloride.calculate the theoretical yield and the percentage yield of hydrogen if 0.27g H2 are collected
  4. chemistry

    write a net ionic equation for the following: 1)Iron (III) chloride reacts with Potassium hydroxide to produce Iron (III) oxide, Potassium chloride, and Hydrogen gas. 2)Hydrochloric acid reacts with Potassium carbonate to produce Potassium …
  5. Chemistry

    A 0.0677g sample of magnesium metal reacted with excess hydrochloric acid to produce 69.9 ml of hydrogen gas. The gas was collected over water at 21.0 degrees Celsius. The levels of water inside and outside the gas collecting tube …
  6. Chemistry Balancing Equations

    I really need help with balancing these equations: PLEASE HELP!! 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride 2. Sodium nitrate reacts with hydrochloric acid to produce …
  7. Chemistry Balancing Equations

    Can you please tell me if these are correct?
  8. Are my answers correct? Chem

    I really need help with balancing these equations: Can you check if my answer are correct?
  9. chemistry

    How many grams of iron are needed to produce 42.8 L of hydrogen gas according to the following reaction at 25oC and 1 atm?
  10. Chemistry 171 Lab

    Suppose we collect hydrogen gas, H2(g), over water at 21◦C in a vessel with total pressure of 743 Torr. If the hydrogen gas is produced by the reaction of aluminum with hydrochloric acid: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) …

More Similar Questions