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    Hi guys could you pls help me with this q from a practice paper: a data book gives a value for the enthalpy change for the reaction between calcium and HCL as -420kjmole-1. Calculate the difference between your value (-400) and express this difference as a percentage of the data book value .
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    Do you know how to calculate the percentage difference between two numbers?
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    (Original post by alow)
    Do you know how to calculate the percentage difference between two numbers?
    no I don't could you please show me the working out
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    (Original post by usmsankhan)
    no I don't could you please show me the working out
    Nope. http://bfy.tw/54nP
 
 
 
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