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19 February, 19:50

What is the percent by mass of sodium in Na2SO4?

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  1. 19 February, 20:50
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    32.37%; that is done with sig figs as well. What you want to do is find the molar mass of the entire substance (142.05g/mol) and the mass of the sodium (45.98g). Divide 45.98/142.05. You get. 3236888 ... Which when rounded for sig figs is. 3237, which is of course 32.37%.
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