Ask Question
13 September, 19:29

The volume of a sample of hydrogen is 771.8 mL and it exerts 638.7 mm Hg pressure at 6.5 ºC. What volume does it occupy at standard temperature and pressure? Select one: a. 653 b. 2.73e4 c. 664 d. 861

+1
Answers (1)
  1. 13 September, 19:39
    0
    627mL (May be something is wrong with the choices)

    Explanation:

    First step: Ideal gas Law to get the moles

    P. V = n. R. T

    where P is pressure in atm (638.7 mmHg)

    V is volume in L

    n, the number of moles, the unknow value at this time

    R the Ideal gas constant 0.082 L. atm/mol. K

    T, the temperature in K (°C + 273)

    760 mmHg ___ 1 atm

    638.7 mmHg ___ (638.7 / 760) = 0.84 atm

    771,8 mL / 1000 = 0.7718 L

    6.5°C + 273 = 279.5 K

    0.7718 L. 0.84atm = n. 0.082 L. atm/mol. K. 279.5K

    0.7718 L. 0.84atm / 0.082 mol. K/L. atm. 279.5K = n

    0,028 moles = n

    Standard temperature and pressure are 273K and 1 atm

    1 atm. Volume = 0,028 moles. 0.082 L. atm/mol. K. 273K

    Volume = (0,028 moles. 0.082 L. atm/mol. K. 273K) / 1atm

    Volume = 0,6268 L = 627mL
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “The volume of a sample of hydrogen is 771.8 mL and it exerts 638.7 mm Hg pressure at 6.5 ºC. What volume does it occupy at standard ...” in 📙 Chemistry if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers