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21 November, 04:26

22 g de um gás estão contidos em um recipiente de volume igual a 17,5 L, a uma temperatura de 77ºC e

pressão de 623 mmHg. Este gás deve ser: Dados: H = 1, O = 16, N = 14, S = 32, C = 12

a) NO

b) H²S

c) SO²

d) CO²

e) NH³

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Answers (1)
  1. 21 November, 07:33
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    Option D.

    Explanation:

    Let's apply the Ideal Gases law to solve the problem.

    P. V = n. R. T

    First of all we convert the temperature value from °C to K

    77°C + 273 = 350K

    and the pressure from mmHg to atm

    623 mmHg. 1 atm/760 mmHg = 0.82 atm

    We replace dа ta: 0.82 atm. 17.5L = n. 0.082 L. atm/mol. K. 350K

    (0.82 atm. 17.5L) / (0.082 L. atm/mol. K. 350K) = n

    0.50 moles = n

    These are the moles that corresponds to 22 g of the gas, so the molar mass will be → 22g / 0.50 mol = 44 g/mol

    That molar mass corresponds to CO₂ → 12 g (C) + 16 g (O). 2 = 44 g/mol
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