Calcium carbide reacts with water to produce acetylene gas according to the following equation:

$$\ce{CaC2 (s) + 2H2O (l) -> Ca(OH)2 (aq) + C2H2 (g)}$$

The product gas, $\ce{C2H2}$ is collected over water at a temperature of $25\degree\ce C$ and a pressure of $750\text{ mmHg}$. If the wet $\ce{C2H2}$ gas formed occupies a volume of $7.52\ce L$, the number of moles of $\ce{CaC2}$ reacted was _____ mol. The vapor pressure of water is $23.8\text{ mmHg}$ at $25\degree\ce C$.

When it comes to making decisions, which of the following statements are true? Select all that apply.

d. Anchoring can help individuals make better decisions.

Hydrogen has two naturally occurring isotopes,

$$^1 H$$

and

$$^2H.$$

Chlorine also has two naturally occurring isotopes,

$$^{35}CI$$

and

$$^{37}Cl$$

Thus, hydrogen chloride gas consists of four distinct types of molecules:

$$^ { 1 } \mathrm { H } ^ { 35 } \mathrm { Cl } , ^ { 1 } \mathrm { H } ^ { 37 } \mathrm { Cl } , ^ { 2 } \mathrm { H } ^ { 35 } \mathrm { Cl } ,$$

and

$$^ { 2 } \mathrm { H } ^ { 37 } \mathrm { Cl }$$

Place these four molecules in order of increasing rate of effusion.

When it comes to making decisions, which of the following statements are true? Select all that apply.

b. Anchoring is always helpful when making decisions.

When it comes to making decisions, which of the following statements are true? Select all that apply.

a. Individuals will make the same choices no matter how information is presented.

Calculate the rms speed for $CO$ molecules at $25^{\circ} C$. What is the ratio of this speed to that of Ar atoms at the same temperature?

Calculate the rms speeds of CO and

$$Cl_2$$

molecules at 300 K.

Place the following gases in order of increasing average molecular speed at

$$25 ^ { \circ } \mathrm { C } : \mathrm { Ne } , \mathrm { HBr } , \mathrm { SO } _ { 2 } , \mathrm { NF } _ { 3 } , \mathrm { CO }$$

Determine whether each of the following changes will increase, decrease, or not affect the rate with which gas molecules collide with the walls of their container: increasing the temperature

Suppose you have two 1-L flasks, one containing

$$N_2$$

at STP, the other containing

$$CH_4$$

at STP. How do these systems compare with respect to number of molecules.

The speed of sound in different gases at a certain temperature T depends on the molar mass of the gases. Show that

$${\frac{v_1}{v_2}} = \sqrt{\frac{M_2}{M_1}},$$

where

$$v_1$$

is the speed of sound in a gas of molar mass

$$M_1$$

and

$$v_2$$

is the speed of sound in a gas of molar mass

$$M_2$$

.

What is the mole fraction of $\mathrm{C}_3 \mathrm{H}_8$ (g) in the flask before reaction?

Which halogens are gases at room temperature and atmospheric pressure?

Give the two elements that are liquids and the five (other than the six noble gases) that are gases at room temperature and atmospheric pressure.