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21 September, 03:50

Nitrate salts (NO3-), when heated, can produce nitrites (NO2-) plus oxygen (O2). A sample of potassium nitrate is heated, and the O2 gas produced is collected in a 730 mL flask. The pressure of the gas in the flask is 2.5 atm, and the temperature is recorded to be 329 K. The value of R = 0.0821 atm L / (mol K)

How many moles of O2 gas were produced?

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  1. 21 September, 04:31
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    0.0676 moles of oxygen gas is produced

    Explanation:

    Step 1: Data given

    Volume of the flask = 730 mL = 0.730 L

    The pressure of the gas in the flask is 2.5 atm

    The temperature is recorded to be 329 K

    Step 2: The balanced equation

    2NO3 - → 2NO2 - + O2

    Step 3: Calculate moles oxygen gas (O2)

    p*V = n * R*T

    ⇒with p = the pressure of oxygen gas = 2.5 atm

    ⇒with V = the volume of the flask = 0.730 L

    ⇒with n = the number of moles O2 gas

    ⇒with R = the gas constant = 0.0821 L*atm/mol*K

    ⇒with T ⇒ the temperature = 329 K

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

    n = (2.5 * 0.730) / (0.0821*329)

    n = 0.0676 moles

    0.0676 moles of oxygen gas is produced
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