Nikhil619
Find the no.of water molecules in Epsomite[MgSO4.7 H20]



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Nikhil619
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@shubhamsrg ?

Peter14
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in how much epsomite?

Peter14
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7 water molecules in 1 molecule of epsomite, so 7 moles of water for 1 mole of epsomite.

Nikhil619
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sry 280 g epsomite..

Peter14
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find how many moles it is

Nikhil619
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ok...so number of moles of epsomite times 7?

Nikhil619
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ok wait...

Nikhil619
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i got molecular mass as 246 is that right?

Peter14
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7*18 for the water
1*molar mass of mg
1*molar mass of s
4*molar mass of o
look right?

Nikhil619
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yea...so 280/246 the whole thing times 7?

Peter14
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yes

Nikhil619
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ok..so that's the number of molecules or should i multiply by Avogadro's nummber? or multiplying by Avogadro's no. will give me number of atoms?

Peter14
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then you multiply by avogadro's number to get the number of molecules from the number of moles

Nikhil619
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ok thnx a lot! :D