Science lab concentration | Chemistry homework help

1. What mass of PbCrO4 should be added to 1 L of water to create a solution with a concentration of 3.2

mol/L?

1034.2 grams of PbCrO4

First, find the formula mass (FM) of lead chromate, PbCrO4. It is 323.2 u (see Example 5). Remember that the formula mass in units u is equal to the mass of 1 mole of the substance in grams. Therefore 1 mole of PbCrO4 has a mass of 323.2 grams. Next recognize that a solution with concentration 3.2 mol/L would require 3.2 moles of the solute added to 1 L of the water. Then find the mass for 3.2 moles of PbCrO4. Multiply the number of moles by the molar mass of the solute. 3.2 𝑚𝑜𝑙𝑒𝑠 𝑜𝑓 𝑃𝑏𝐶𝑟𝑂4 ( 323.2 𝑔 𝑃𝑏𝐶𝑟𝑂4 1 𝑚𝑜𝑙𝑒 𝑜𝑓 𝑃𝑏𝐶𝑟𝑂4 ) = 1034.2 𝑔 𝑃𝑏𝐶𝑟𝑂4 ---------------------------------------------------------------------------------------------------------------------------- Concentration PHSC 1021 online 4 | P a g e Appendix A

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