Question

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

Answer 1

@shubhamsrg ?

Answer 2

in how much epsomite?

Answer 3

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

Answer 4

sry 280 g epsomite..

Answer 5

find how many moles it is

Answer 6

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

Answer 7

ok wait...

Answer 8

i got molecular mass as 246 is that right?

Answer 9

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

Answer 10

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

Answer 11

yes

Answer 12

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?

Answer 13

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

Answer 14

ok thnx a lot! :D