no. I figured this out myself right after posting here (as usual, only asking or writing down the problem helps to solve it)
If you weigh 203.301 g = 1 mol of MgCl2*6H2O you are weighing 1 mol of MgCl2 at the same time cause mole is the number of molecules. Crystallization water doesn't matter cause it dissolves in when you fill up. Preparing a g/L -solution would be a different story.
thanks anyway
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