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28 January, 05:08

What is the molarity of formaldehyde in a solution containing 0.25 grams of formaldehyde per mL?

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  1. 28 January, 05:50
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    8.33mol/L

    Explanation:

    First, let us calculate the molar mass of of formaldehyde (CH2O). This is illustrated below:

    Molar Mass of CH2O = 12 + (2x1) + 16 = 12 + 2 + 16 = 30g/mol

    Mass of CH2O from the question = 0.25g

    Number of mole CH2O = ?

    Number of mole = Mass / Molar Mass

    Number of mole of CH2O = 0.25/30 = 8.33x10^-3mole

    Now we can calculate the molarity of formaldehyde (CH2O) as follow:

    Number of mole of CH2O = 8.33x10^-3mole

    Volume = 1mL

    Converting 1mL to L, we have:

    1000mL = 1L

    Therefore 1mL = 1/1000 = 1x10^-3L

    Molarity = ?

    Molarity = mole / Volume

    Molarity = 8.33x10^-3mole/1x10^-3L

    Molarity = 8.33mol/L

    Therefore, the molarity of formaldehyde (CH2O) is 8.33mol/L
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