Ask Question
16 March, 07:07

A 55.50 g gas sample of a gas, at stp, has a volume of 15.0 l. calculate the molecular mass of the gas

+3
Answers (2)
  1. 16 March, 07:24
    0
    Answer is: the molar mass of gas is 82.83 g/mol.

    m (gas) = 55.50 g; mass of gas.

    V (gas) = 15.0 L; volume of gas.

    Vm = 22.4 L/mol; molar volume of gas on STP.

    n (gas) = V (gas) : Vm.

    n (gas) = 15 L : 22.4 L/mol.

    n (gas) = 0.67 mol; amount of gas.

    M (gas) = m (gas) : n (gas).

    M (gas) = 55.5 g : 0.67 mol.

    M (gas) = 82.83 g/mol.
  2. 16 March, 07:29
    0
    We can use the ideal gas law equation to find the number of moles of gas

    PV = nRT

    where P - standard pressure - 101 325 Pa

    V - volume - 15.0 x 10⁻³ m³

    n - number of moles

    R - universal gas constant - 8.314 Jmol⁻¹K⁻¹

    T - standard temperature - 273 K

    substituting the values in the equation

    101 325 Pa x 15.0 x 10⁻³ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 273 K

    n = 0.670 mol

    molecular mass of the gas can be calculated as follows

    molar mass = mass / number of moles

    = 55.50 g / 0.670 mol

    molecular mass of gas is 82.8 g/mol
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A 55.50 g gas sample of a gas, at stp, has a volume of 15.0 l. calculate the molecular mass of the gas ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers