At a pH of 7.40, what is the ratio of the molar concentrations of H$_{2}$PO$_{4}^{-}$ to H$_{3}$PO$_{4}$?

Give the name and calculate the molar mass for $\mathrm{NaC}_2 \mathrm{H}_3 \mathrm{O}_2$

Calculate the molar solubility of $\mathrm{Ag}_2 \mathrm{SO}_4$ in
(a) $0.22 \mathrm{M}$ $\mathrm{AgNO}_3$

Calculate the molar solubility of $\mathrm{Cd}(\mathrm{OH})_{2}, K_{\mathrm{sp}}=5.9 \times 10^{-15}.$

Calculate the molar mass of $\mathrm{NaCl}$ and tell whether it is equal to $51.79 \mathrm{~g} \mathrm{~mol}^{-1}$ ?

Determine the molar mass of $\text{Pt}\left(\text{NH}_3\right)_2\text{Cl}_2$.

Find the molar mass. a. $CsCl$, b. $KClO_3$, c. $C_6H_{12}O_6$, d. $(NH_4)_2HPO_4$, e. $C_2H_5NO_2$.

How many anions are there in 20.0 g of $\ce{FeCl3}$? The molar mass of $\ce{FeCl3}$ is 162.2 g/mol.

The molar solubility of $\mathrm{MnCO}_3$ is $4.2 \times 10^{-6} \mathrm{M}$. What is $K_{\text {sp }}$ for this compound?

The fluoroapatite that makes up the enamel of teeth has the formula $\mathrm{Ca_5(PO_4)_3F}$. What is the molar mass of fluoroapatite?

Use the molar volume to calculate the following at $STP$: the number of grams of $Ne$ contained in $11.2$ $L$ of $Ne$ gas

Determine the molar mass of these ceramic materials.

(a) $\mathrm{HfN}$,

(b) $\mathrm{ThO}_2$,

(c) $\mathrm{BaTiO}_3$

Give the name and calculate the molar mass for each of the following substances.
a. $\mathrm{H}_3 \mathrm{PO}_4$

Give the name and calculate the molar mass for each of the following substances.
b. $\mathrm{Hg}_2 \mathrm{Cl}_2$