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    How do I balance
    AsCl3 + NaBH4 = AsH3 + NaCl + BCl3
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    Seems a bit tricky but you can use a set of equations to solve even the most stubborn 'balance this equation' question:

    1. Put letters in front of each species:

    aAsCl3 + bNaBH4 --> cAsH3 + dNaCl + eBCl3

    2. Create a table for each element in the species and write an algebraic equation:

    As : 1a + 0b --> 1c + 0d + 0e
    Cl : 3a + 0b --> 0c + 1d + 3e
    Na : 0a + 1b --> 0c + 1d + 0e
    B : 0a + 1b --> 0c + 0d + 1e
    H : 0a + 4b --> 3c + 0d + 0e

    3. Use the equations to find the numbers e.g.

    For hydrogen 4b = 3c and since b and c have to be whole numbers we can say c = 4 and b = 3

    Again it looks a lot harder than doing it 'one by one' but it will always lead you to the correct answer :yep:
 
 
 
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