Solve for x chem problem

Chemistry
Tutor: None Selected Time limit: 1 Day

Epsom salts, a strong laxative used in veterinary medicine, is a hydrate, which means that a certain number of water molecules are included in the solid structure. The formula for Epsom salts can be written as MgSO4 · x H2O, where x indicates the number of moles of H2O per mole of MgSO4. When 5.469 g of this hydrate is heated to 250°C, all the water of hydration is lost, leaving 2.671 g of MgSO4. What is the value of x?

Give the correct number of significant digits and tell why u used that many!

Jul 24th, 2015

Thank you for the opportunity to help you with your question!

MgSO4.xH2O = 24+32+64+x(2+16) = 120+18x

MgSO4 = 24+32+64 = 120

xH2O = 18X

120+18x hydrate results in 120 gms of MgSO4.

Hence, [120/(120+18x)]*5.469 = 2.671

Solving it, we get x = 6.9837

So we can say that x =7. 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 24th, 2015

My teach says put x in the correct number of sig figs how do I do that?

Jul 24th, 2015

we are getting x = 6.9837 after calculation and we are putting it as x = 7. It is put in significant figures this way. 

Jul 24th, 2015

What is the rule behind this though?

Jul 24th, 2015

I thought we round to this much:  6.983 because the two numbers given are this number

Jul 24th, 2015

Round to the nearest  digit.

Jul 24th, 2015

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