Chemistry

posted by .

A 0.188g sample of unknown metal, X (s), produced 71.4 ml of hydrogen gas when reacted with HCL according to the equation: X(s)+2HCL(aq)--->XCl2(aq)+H2(g)

The gas was collected over water at 23 degrees Celsius. The levels of water inside and outside the gas collecting tube are identical. The vepor pressure of water at 23 degrees Celsius is 21.1 mmHg and the atmospheric pressure is 752 mmHg. Calculate the molar mass of the unknown metal, X. (R=0.0821Latm/molK)

  • Chemistry -

    Use PV = nRT to solve for n
    P = (752-21.1)/760
    V = 0.0714 L
    T = 296 K
    The equation in the problems tells you that mols H2 equal mols X.
    atomic mass X = grams/moles.
    My best guess is Zn but you need to do the work. I don't know how close the value is supposed to be but I don't get exactly the atomic mass Zn. Check my work carefully.

  • Chemistry -

    Glycerol is a syrup liquid often used in cosmetics and soaps. A 2.50L sample of pure glycerol has a mass of 3.15 x 10 to the 3rd power grams. What is the density in grams per cubic cm

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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 …
  2. Chemistry

    Need help solving this problem. A 0.188g sample of unknown metal, X (s), produced 71.4ml of hydrogen gas when reacted with HCl according to the equation: X(s)+2HCl(aq)--> XCl2(aq)+H2(g) The gas was collected over water at 23 degrees …
  3. 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 …
  4. chemistry

    2. Zinc metal reacts with HCL similarly to magnesium: Zn(s) + 2HCL(aq) = ZnCl2(aq) + H2(g). the H2 gas produced was collected over water at 25 degrees Celsius and had a volume of 7.80L at 0.980 atm. How many grams of Zn were consumed …
  5. chemistry

    A 0.0677 g sample of magnesium metal reacted with excess hydrochloric acid solution to produce 69.9 mL of hydrogen gas. The gas was collected over water at 21.0° C. The levels of water inside and outside the gas collecting tube are …
  6. Chemistry

    A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 …
  7. Chemistry-DrBob222

    A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 …
  8. Chemistry-DrBob222

    I got 62.9 mL. Is this correct? I think HCl is the LR. A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected
  9. Chemistry

    In need of help setting up each of these problems. Under the conditions in a laboratory experiment, 0.0513 grams of aluminum (At. Wt.=27.0) was reacted with excess hydrochloric acid to produce hydrogen gas according to the following …
  10. Chemistry

    Assume that 5.00 grams of zinc react with excess HCl according to the following equation: Zn + 2HCl = ZnCl2 + H2 The hydrogen was collected over water at 20.0C and the prssure of the atmosphere is 751 mmHg. The pressure of the water …

More Similar Questions