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Keith_Richards [23]
3 years ago
5

What is the percent by mass of water in Na2SO4 • 10H2O?

Chemistry
2 answers:
bulgar [2K]3 years ago
5 0
We determine the percent by mass of water in the compound by dividing the mass of  water by the total mass. The total mass of Na2SO4.10H2O is equal to 322 g. The mass of water is 180 g. 
       
                    percent by mass of water = (180 / 322)*(100 %) = 55.9%
lara31 [8.8K]3 years ago
3 0

55.92 percent is the correct answer for online chemistry I just took the test!

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Explanation:

The reaction is this:

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2 moles of ethane reacts with 7 moles of oxygen, to make 4 mol of dioxide and 6 moles of water vapor.

If the oxygen is in excess, we make the calculate with the ethane (limiting reactant)

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A. Yes, the substance must be water.

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WILL MARK BARINLIEST
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In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory.

so the third one should be correct.

6 0
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