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16 June, 16:39

A sample of gas has a mass of 0.555g. volume is 117 mL at a temperature of 85 degrees Celsius and a pressure of 0.99 atm. What is the molar mass of the gas?

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  1. 16 June, 16:44
    0
    The molar mass of the gas is 140.86 g/mol

    Explanation:

    Step 1: Data given

    Mass of the gas = 0.555 grams

    Volume of the gas = 117 mL = 0.117 L

    Temperature = 85 °C

    Pressure = 0.99 atm

    Step 2: Calculate the number of moles

    p*V = n*R*T

    ⇒ with p = the pressure of the gas = 0.99 atm

    ⇒ with V = the volume = 0.117 L

    ⇒ with n = the number of moles

    ⇒ with R = the gas constant = 0.08206 L*atm/K*mol

    ⇒ with T = the temperature of the gas = 85 °C = 358.15 Kelvin

    n = (p*V) / (R*T)

    n = (0.99 * 0.117) / (0.08206 * 358.15)

    n = 0.00394 moles

    Step 3: Calculate molar mass of the gas

    Molar mass = mass / moles

    Molar mass = 0.555 grams / 0.00394 moles

    Molar mass = 140.86 g/mol

    The molar mass of the gas is 140.86 g/mol
  2. 16 June, 17:09
    0
    Answer: 0.04 moles

    Explanation:

    pV = nRT

    p=pressure = 0.99atm

    v = volume = 117ml = 0.117L

    n = number of moles = n

    T = temperature = 85 + 273 = 358k

    R = rate constant = 0.082 L. atm/kmol

    n = pV/RT = 0.99 X 0.117 / (0.082 X 358)

    = 0.004 moles
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