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31 March, 15:54

A compound is 57.1% oxygen and the remainder carbon. using oxygen as the standard (16 amu) and assuming a 1:1 atom ratio, calculate the relative mass of a carbon atom.

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  1. 31 March, 19:14
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    Let's start with the amount given in percent. Let our basis be 100 grams of compound. So, that means that in this amount, 57.1 g is oxygen and 100-57.1=42.9 g is carbon. Since there is 1:1 atom ratio, it also means that moles oxygen = moles carbon.

    Moles = Mass/Relative Mass

    Let x be the relative mass of oxygen

    57.1/16 = 42.9/x

    Solving for x,

    x = 12.02 amu
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