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7 September, 20:56

How molecules of N2 gas can be present in a 2.5 L flask at 50°C and 650 mmHg?

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  1. 7 September, 22:56
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    0.482 * 10²³ molecules

    Explanation:

    Given dа ta:

    Volume of gas = 2.5 L

    Temperature of gas = 50°C (50+273 = 323 k)

    Pressure of gas = 650 mmHg (650/760 = 0.86 atm)

    Molecules of N₂=?

    Solution:

    PV = nRT

    n = PV/RT

    n = 0.86 atm * 2.5 L / 0.0821 atm. mol⁻¹. k⁻¹. L * 323 k

    n = 2.15 atm. L / 26.52 atm. mol⁻¹. L

    n = 0.08 mol

    Number of moles of N₂ are 0.08 mol.

    Number of molecules:

    one mole = 6.022 * 10²³ molecules

    0.08*6.022 * 10²³ = 0.482 * 10²³ molecules
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