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19 January, 12:34

Tin (II) fluoride (SnF2) is often added to toothpaste as an ingredient to prevent tooth decay. What is the mass of F in grams in 33.7 g of the compound?

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  1. 19 January, 14:58
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    In 33.7 grams SnF2 we have 8.17 grams of F

    Explanation:

    Step 1: Data given

    Mass of SnF2 = 33.7 grams

    Molar mass of SnF2 = 156.69 g/mol

    Molar mass of F = 19.00 g/mol

    Step 2: Calculate moles of SnF2

    Moles SnF2 = mass / molar mass

    Moles SnF2 = 33.7 grams / 156.69 g/mol

    Moles SnF2 = 0.215 moles

    Step 3: Calculate moles F

    For 1 mol SnF2 we have 2 moles F

    For 0.215 moles SnF2 we have 2*0.215 = 0.430 moles F

    Step 4: Calculate mass F

    Mass F = moles F * molar mass F

    Mass F = 0.430 moles * 19.00 g/mol

    Mass F = 8.17 grams

    In 33.7 grams SnF2 we have 8.17 grams of F
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