Consider a 0.20 M NH4Cl aqueous solution. Rank the following species in the solution from highest to lowest concentration. NH3, Cl-, H2O, NH4+, OH-, H3O+
Consider a 0.10 M aqueous solution of sodium nitrite, NaNO2. Rank the following species in the solution from highest to lowest concentration.
OH-, HNO2, NO2-, H3O+, H2O, Na+
The acetate ion is the conjugate base of acetic acid. The Ka of acetic acid is 1.76×10–5. What is the pH of a 0.100 M solution of sodium acetate?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

the answers would be

the first one and the second one

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24