Using a value of Ksp = 1.8 x 10-2 for the reaction PbCl2(s) Pb+2(aq) + 2Cl-(aq). The concentration of the products yields a value of 2.1 x 10-2.

Select the TWO statements that are true.

Ions are recombining to form a solid precipitate.
The concentrations of Pb+2(aq) and Cl-(aq) are expected to decrease.
The concentrations of Pb+2(aq) and Cl-(aq) are expected to increase.
The concentration of PbCl2(s) is expected to increase.
It is not possible to have a system with Ksp > 1.8 x 10-2.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

idk what is it? is this a question that you know the answer or u dont

the answer is symmetrical : )