A chemist needs 1.00 L of an aqueous 0.200 M K2Cr2O7 solution. What mass of solid must be weighed out to make this solution?

Question

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Answer 1

molar mass K₂Cr₂O₇ = 294 g/mol

0.200 M means 0.200 moles K₂Cr₂O₇/Liter

Converting 0.200 moles K₂Cr₂O₇ to grams of K₂Cr₂O₇ we have...

0.200 moles x 294 g/mol = 58.8 g K₂Cr₂O₇ needs to be weighed out