Answer:
The molarity of the Pb(NO3)2 solution is 0.24 M
Explanation:
Assuming there was no loss during filtration, we can calculated amount of moles Pb(NO3)2 from the 13.25 g of PbCl2 ussing molar mass of PbCl2
13.25 g / 278.1 g = 0.04 moles of PbCl2
According balanced equation 2NaCl + Pb(NO3)2 = 2NaNO3 + PbCl2, 1 mol of Pb(NO3)2 produces 1 mol of PbCl2. So, 0.04 moles of Pb(NO3)2 produces PbCl2
Molarity is = moles of solute/volumen of solution (L)=0.04/0.2= 0.24
I hope my answer helps you
The chemical formula of the solute is NaNO3. The mass of this is 1.4*85=119 g. The boiling point of the solution is higher than water. The molarity of this solution is 1.4/2=0.7 M.
Answer:
nonpolar covalent bond: A covalent bond in which the bonding electrons are shared equally between the two atoms. polar covalent bond: A covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.
Answer:
a. True
b. False
c. True
d. False
e. False
Explanation:
A. (true) The equilibrium constant K is defined as
In any case
aA +Bb ⇌ Cd +dD
where K is:
A large value on K means that the concentration of products is bigger than the concentrations of reagents, so the forward reaction is favored, and the equilibrium lies to the right.
B. (False) When we work with gases, we use partial pressure to make calculations in the equilibrium, so we estimate Kp as:
Using the ideal gas law, we can get a relationship between K and Kp
Pv=nRT where we know that is the molar concentration. When we replace P in the expression for Kp we get:
Reorganizing the equation:
We can see K in the expression
Delta n = c+d-a-b
For the reaction
Delta n = 2-1-1=0
So Kp=K in this case.
C. (true) The value of K just depends on the temperature that’s why changing the among of products won’t have any effect on its value.
D. (false) as we can see this reaction involve a heterogeneous system with solids and gases. For convention the concentration for solids and liquids can be considered constant during the reaction that’s why they’re not include in the calculation for the equilibrium constant. Taking this into account the expression for the equilibrium for this reaction is:
So we can see that is not include in the expression.
E. (False) The equilibrium is defined as the point where the rate of the forward reaction is the same to the rate of the reverse reaction. The value of K is telling you which reaction is favored but the rate of both reactions is the same in this point. (see picture)