Question

Calculate the molarity of a solution prepared by dissolving 12.9 g of na2cro4 in enough water to produce a solution with a volume of 740. ml

Answer 1

To find the molarity of a Na2CrO4 solution, divide the number of moles of Na2CrO4 by the volume of the solution in liters. The molarity is calculated to be 0.1077 M.

Step-by-step explanation:

The question asks to calculate the molarity of a solution made by dissolving sodium chromate (Na2CrO4) in water. To find the molarity, the number of moles of Na2CrO4 needs to be determined first. After that, you divide the number of moles by the volume of the solution in liters.

First, the molar mass of Na2CrO4 is calculated using the periodic table:
Na = 22.99 g/mol × 2 = 45.98 g/mol
Cr = 51.99 g/mol
O = 16.00 g/mol × 4 = 64.00 g/mol
Total = 161.97 g/mol

Next, the moles of Na2CrO4 are found:
12.9 g ÷ 161.97 g/mol = 0.0797 moles

Then, convert the volume of the solution from milliliters to liters:
740 ml = 0.740 L

Finally, calculate the molarity:
0.0797 moles ÷ 0.740 L = 0.1077 M (Molarity = moles/volume)

Therefore, the molarity of the Na2CrO4 solution is 0.1077 M.

Answer 2

It would be salt to be exact