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23 March, 01:02

Assume that you take 0.46 mol of KBr and do some chemistry on it such that all of the potassium and bromine are separated. How many grams of potassium should you have?

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  1. 23 March, 03:14
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    We'll have 13.85 grams of potassium

    Explanation:

    Step 1: Data given

    Moles KBr = 0.46 mol

    Molar mass KBr = 119.00 g/mol

    Molar mass K = 30.10 g/mol

    Step 2: The balanced equation

    2KBr ⇆ 2K + Br2

    Step 3: Calculate moles of K

    For 2 moles KBr consumed we'll have 2 moles K and 1 mol Br2

    For 0.46 moles KBr we'll have 0.46 moles K

    Step 4: Calculate mass of K

    Mass K = moles K * molar mass K

    Mass K = 0.46 moles * 30.10 g/mol

    Mass K = 13.85 grams

    We'll have 13.85 grams of potassium
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