Ask Question
7 July, 15:18

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

+5
Answers (2)
  1. 7 July, 18:40
    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. 7 July, 19:18
    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 you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers