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  Question 16 of 21   Moles/Stoichiometry
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

What is the percent by mass of water in the hydrate Na2CO3 * 10H2O (formula mass = 286)?


 1.  6.89%

 2.  14.5%

 3.  26.1%

 4.  62.9%

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