Answer is: the maximum concentration of Pb²⁺ is 6.8·10⁻³ M.
Chemical reaction 1: PbCl₂(s) → Pb²⁺(aq) + 2Cl⁻(aq).
Chemical reaction 2: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Ksp(PbCl₂) = 1.7·10⁻⁵.
c(NaCl) = c(Cl⁻) = 0.0500 M.
Ksp(PbCl₂) = c(Pb²⁺) · c(Cl⁻)².
c(Pb²⁺) = Ksp(PbCl₂) ÷ c(Cl⁻)².
c(Pb²⁺) = 1.7·10⁻⁵ M³ ÷ (0.0500 M)².
c(Pb²⁺) = 0.000017 M³ ÷ 0.0025 M².
c(Pb²⁺) = 0.0068 M = 6.8·10⁻³ M.
<h2>Answer:</h2>
Valence electrons are that electrons that are present in the atom, outside the nucleus in orbits. The list of atoms with correct number of valance electrons is as follows;
A. Nitrogen: 5
B. Silicon: 4
C. Oxygen: 6
D. Magnesium: 2
Missing question:
KNO₃(s) + energy ⇄ K⁺(aq) + NO₃⁻(aq)
Which change causes the equilibrium to shift?
(1) increasing pressure .
(2) increasing temperature.
(3) adding a noble gas.
(4) adding a catalyst.
Answer is: (2) increasing temperature.
<span>This is endothermic reaction, because heat is included as reactant.
According to Le
Chatelier's Principle, the position of equilibrium moves to counteract the
change, because heat (temperature) is increased, system consume that heat, so
equilibrium is shifted to right, by decreasing concentration of reactants and
increasing concentration of product.</span>
Answer:
72.2 moles of water is spilled
Explanation:
as moles=mass/mr
so mr of water is 16+2=18
13000/18=72.2
for the second one you can work out the moles of o2
by using moles= number of particles /6.02*10^23
so 4.65*10^26/6.02*10^23
so i got 772.4 on my calculator to work out the amount of mass
u use the equation mass=moles*mr
so 777.2*16=12435g of oxygen gas
hope it helps :)
