Question

1. the graph above shows how a particular real gas deviates from ideal behavior at very high pressures. based on this information, which of the following is most likely the gas and gives the reason based on kinetic molecular theory? a. h2, because it has the smallest mass. b. n2, because its molecules have a triple bond. c. ne, because it has a completely filled valence shell. d. so2, because it has the largest molecular volume. 16. what volume of a 0.100m hcl stock solution should be used to prepare 250.00 ml of 0.0250m hcl? a. 1.00 ml b. 16.0 ml c. 62.5 ml d. 100. ml 17. 500.ml aqueous solution of na3po4 (molar mass=164 g/mol) was prepared using 82 g of the solute. what is the molarity of na3po4 in the resulting solution? a. 0.0010 m b. 0.16 m c. 0.25 m d. 1.0 m

Explanation:

15.

According to kinetic - molecular theory, real gases deviate from ideal behavior at high pressures mainly due to the volume of the gas molecules themselves. Larger - volume molecules cause more deviation. Among the options, $SO_2$ has the largest molecular volume compared to $H_2$, $N_2$, and $Ne$. The other reasons given for $H_2$, $N_2$, and $Ne$ are not the main factors for deviation from ideal behavior at high pressures.

Step1: Use the dilution formula $M_1V_1 = M_2V_2$

Here, $M_1$ is the molarity of the stock solution, $V_1$ is the volume of the stock solution, $M_2$ is the molarity of the diluted solution, and $V_2$ is the volume of the diluted solution. We know that $M_1 = 0.100M$, $M_2=0.0250M$, and $V_2 = 250.00\ mL$.

Step2: Solve for $V_1$

$V_1=\frac{M_2V_2}{M_1}=\frac{0.0250\ M\times250.00\ mL}{0.100\ M}= 62.5\ mL$

Step1: Calculate the number of moles of $Na_3PO_4$

The number of moles $n=\frac{m}{M}$, where $m$ is the mass of the solute and $M$ is the molar mass. Given $m = 82\ g$ and $M = 164\ g/mol$, so $n=\frac{82\ g}{164\ g/mol}=0.5\ mol$.

Step2: Calculate the molarity $M$

The volume of the solution $V = 500\ mL=0.5\ L$. Molarity $M=\frac{n}{V}=\frac{0.5\ mol}{0.5\ L}=1.0\ M$

Answer:

D. $SO_2$, because it has the largest molecular volume.

16.