Given that the rms speed of a helium atom at a certain temperature is $1350 \mathrm{~m} / \mathrm{s}$, find by proportion the rms speed of an oxygen $\left(\mathrm{O}_2\right)$ molecule at this temperature. The molar mass of $\mathrm{O}_2$ is $32.0 \mathrm{~g} / \mathrm{mol}$, and the molar mass of $\mathrm{He}$ is $4.00 \mathrm{~g} / \mathrm{mol}$

Predict which substance has greater molar entropy. Explain.
(b) $\mathrm{KClO}_3(s)$ or $\mathrm{KClO}_3(a q)$

How many formula units are there in 302.48 g of zinc chloride, $ZnCl_2$? The molar mass of zinc chloride is 136.29 g/mol.

Calculate the molar mass for the $\mathrm{C}_{18} \mathrm{H}_{34} \mathrm{O}_2$, oleic acid, from olive oil.

What is the molar mass of K$_3$Fe(C$_2$O$_4$)$_3$ $\cdot$ 3H$_2$O?

What is the molar mass of a gas that has a density of 1.02 g/L at 0.990 atm pressure and $37^{\circ} \mathrm{C}$?

What is the molar solubility of $\mathrm{Pb}(\mathrm{OH})_{2}$ in a 0.138-M solution of $\mathrm{CH}_{3} \mathrm{NH}_{2}$?

Calculate the molar solubility of AgBr in 0.035 M NaBr $\left(K_{\mathrm{sp}}=5 \times 10^{-13}\right)$.

Refer to the periodic table and calculate the molar mass for the following.

trinitroglycerin, C$_{3}$H$_{5}$O$_{3}$(NO$_{2}$)$_{3}$

What is the molar mass of K$_3$[Fe(C$_2$O$_4$)$_3$] $\times$ 3H$_2$O?

Determine the molar mass of the following: calcium acetate, $\mathrm{Ca}\left(\mathrm{CH}_3 \mathrm{COO}\right)_2$.

Predict which substance has greater molar entropy. Explain.
(c) $\mathrm{CH}_4(g)$ or $\mathrm{CCl}_4(l)$

Calculate the molar mass of a gas that has a density of 1.98 g/L at STP. Express your answer with the appropriate units.

Calculate the molar solubility of $\mathrm{MgF}_2$ in $0.10 \mathrm{M} \mathrm{~MgCl}_2$ at $25^{\circ} \mathrm{C}$.