anonymous
  • anonymous
Find the no.of water molecules in Epsomite[MgSO4.7 H20]
Chemistry
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
in how much epsomite?
anonymous
  • anonymous
7 water molecules in 1 molecule of epsomite, so 7 moles of water for 1 mole of epsomite.

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

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