What mass of precipitate will form if 1.50 L of highly concentrated Pb (ClO3) 2 is mixed with 0.350 L of 0.170 M NaI? Assume the reaction goes to completion.

Question

Chemistry

Zackary Jennings

5 June, 19:06

What mass of precipitate will form if 1.50 L of highly concentrated Pb (ClO3) 2 is mixed with 0.350 L of 0.170 M NaI? Assume the reaction goes to completion.

+3

Answers (1)

Know the Answer?

Ellie · Answer 1

13.7 g The balanced formula is: Pb (ClO3) 2 (aq) + 2NaI (aq) = = > PbI2 (s) + 2NaClO3 (aq) The number of moles of NaI we have is the volume of fluid multiplied by the molarity so 0.350 * 0.170 = 0.0595 moles Since the NaI is the limiting reactant, for every two moles used, we'll produce 1 mole of precipitate. So 0.0595 mole / 2 = 0.02975 mole Now we need to calculate the molar mass of PbI2. Looking up the atomic weights Atomic weight Lead = 207.2 Atomic weight iodine = 126.90447 Molar mass PbI2 = 207.2 + 2 * 126.90447 = 461.00894 g/mol Now multiply the molar mass by the number of moles we have. 461.00894 g/mol * 0.02975 mol = 13.71501597 g Rounded to 3 significant figures, the answer is 13.7 g