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31 August, 08:47

How many molecules of carbon monoxide are in 10 mL at STP

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  1. 31 August, 10:40
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    The number of carbon monoxide that are in 10 ml at STP is 2.68 x 10²⁰ molecules

    calculation

    Step 1 : convert 10 ml to L

    convert 10 ml to L = 10/1000 = 0.01 L

    Step 2: find the moles of CO at STP

    That is at STP 1 mole = 22.4 L

    ? moles = 0.01 L

    by cross multiplication

    = {0.01 L x 1 mole) / 22.4 L} = 4.46 x 10⁻⁴ moles

    Step 3; find the number of molecules of Co using the Avogadro's law constant

    that according to Avogadro's law 1 moles = 6.02 x 10²³

    4.46 x 10⁻⁴ moles = ? molecules

    by cross multiplication

    = { (4.46 x 10⁻⁴ moles) x (6.02 x 10²³ molecules) / 1 mole} = 2.68 x 10²⁰ molecules
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