Did you know that m stands for Molality and M stands for Molarity? From the wording I assume you mean M but moles is calculated the same.
You want how many moles? That's M x L = 2.16 x 0.250 = ? Then
grams = moles K2Cr2O7 x molar mass K2Cr2O7.
How many grams of potassium dichromate are required to prepare a 250ml solution of whose concentration is 2.16m.?
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