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17 May, 17:40

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:

2 NaN3 (s) → 2 Na (s) + 3 N2 (g)

How many moles of N2 are produced by the decomposition of 1.25 mol of sodium azide?

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  1. 17 May, 19:56
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    Answer: 1.875 moles

    Explanation:

    2 NaN3 (s) → 2 Na (s) + 3 N2 (g)

    From the equation above, Sodium azide has a chemical formula of NaN3 while nitrogen gas has a chemical formula of N2.

    Therefore, If on decomposition

    2 moles of NaN3 produce 3 moles of N2

    1.25 mol of NaN3 produce Z moles of N2

    To get the value of Z, cross multiply

    Z x 2 moles = 3 moles x 1.25 moles

    2 moles•Z = 3.75 moles²

    Divide both sides by 2 moles

    2 moles•Z/2 moles = 3.75 moles²/2 moles

    Z = 1.875 moles

    Thus, 1.875 moles of N2 are produced by the decomposition of 1.25 mol of sodium azide
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