Calculate the molarity of a solution prepared by dissolving 12.3g of Na2CrO4 in enough water to...

Calculate the molarity of a solution prepared by dissolving 12.3g of Na2CrO4 in enough water to produce a solution with a volume of 900.mL . Express the molarity to three significant digits.

Expert Solution

The molarity of Na2CrO4 = 161.97 g/mol

moles of Na2CrO4 = mass of Na2CrO4 / molar mass of Na2CrO4

= 12.3/161.97

= 0.076 moles

0.076 moles are present in 900 mL solution

molarity = moles/1000mL of solvent

= 0.076x1000/900 = 0.0844M

= 8.44 x10^-1 M (expressed in three significant figures)

queen_honey_blossom answered 1 month ago

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