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10 April, 15:15

A balloon containing helium gas expands from 230

mL to 860 mL as more helium is added. What was

the initial quantity of helium present if the

expanded balloon contains 3.8 x 10-4 mol,

assuming constant temperature and pressure?

Which of the variables are known?

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Answers (1)
  1. 10 April, 15:31
    0
    1.0 * 10^ (-4) mol

    Explanation:

    For gases:

    n1/n2 = V1/V2

    n1/3.8*10^ (-4) mol = 230 mL / 860 mL

    n1 = 3.8*10^ (-4) * 230/860 = 1.0 * 10^ (-4) mol
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