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

Chemistry
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in how much epsomite?
7 water molecules in 1 molecule of epsomite, so 7 moles of water for 1 mole of epsomite.

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Other answers:

sry 280 g epsomite..
find how many moles it is
ok...so number of moles of epsomite times 7?
ok wait...
i got molecular mass as 246 is that right?
7*18 for the water 1*molar mass of mg 1*molar mass of s 4*molar mass of o look right?
yea...so 280/246 the whole thing times 7?
yes
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?
then you multiply by avogadro's number to get the number of molecules from the number of moles
ok thnx a lot! :D

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