What is the rate of effusion for a gas that has a molar mass twice that of a gas that effuses at a rate of 3.6 mol/min?

For each element, tell how many electrons are in each energy level and write the electron dot structure. Br

A gas effuses through an opening one-fifth as fast as helium gas effuses through the same opening. (a) Is the gas heavier than helium? (b) What is the molar mass of the gas?

A researcher mixes a solution that is 40 percent helium gas and 60 percent nitrogen gas. Which gas is the solute and which is the solvent? What would the mixture look like through a microscope? What would the mixture look like at the atomic level?

$\triangle X Y Z$ is an obtuse triangle. What can you say about the types of angles in $\triangle X Y Z ?$

If two gases have molar masses $M_1$ and $M_2,$ Graham’s law states that the ratio R of their rates of effusion through a small opening is given by $R=\sqrt{M_{1} / M_{2}}.$ The effusion rate of an unknown gas through a small opening is measured to be $1.66 \pm 0.03$ times greater than the effusion rate of carbon dioxide. The molar mass of carbon dioxide may be taken to be 44 g/mol with negligible uncertainty. a. Estimate the molar mass of the unknown gas, and find the uncertainty in the estimate. b. Find the relative uncertainty in the estimated molar mass.

En tu opinión, ¿por qué la gente discrimina? ¿Tiene motivos personales? Explica.

Calculate the ratio of effusion rates for nitrogen $(N_2)$ and neon (Ne).

At one instant, a 17.5-kg sled is moving over a horizontal surface of snow at 3.50 m/s. After 8.75 s has elapsed, the sled stops. Use a momentum approach to find the average friction force acting on the sled while it was moving.

A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at $30.0^{\circ}$ above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 12.0 s and then continues at constant speed. (a) What power must the winch motor provide when the car is moving at constant speed? (b) What maximum power must the winch motor provide? (c) What total energy has transferred out of the motor by work by the time the car moves off the end of the track, which is of length 1250 m?

In one method of manufacturing nitric acid, ammonia is oxidized to nitrogen monoxide and water:

$$4 \mathrm { NH } _ { 3 } ( \mathrm { g } ) + 5 \mathrm { O } _ { 2 } ( g ) \longrightarrow 4 \mathrm { NO } ( g ) + 6 \mathrm { H } _ { 2 } \mathrm { O } ( l )$$

What volume of oxygen will be used in a reaction of 2800 L of

$$NH_3$$

? What volume of NO will be produced? All volumes are measured under the same conditions.

Estimate the molar mass of a gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Fluorine gas reacts violently with water to produce hydrogen fluoride and ozone according to the following equation:

$$3 \mathrm { F } _ { 2 } ( g ) + 3 \mathrm { H } _ { 2 } \mathrm { O } ( l ) \longrightarrow 6 \mathrm { HF } ( g ) + \mathrm { O } _ { 3 } ( \mathrm { g } )$$

What volumes of

$$O_3$$

and HF gas would be produced by the complete reaction of

$$3.60 \times 10 ^ { 4 } \mathrm { mL }$$

of fluorine gas? All gases are measured under the same conditions.

Calculate the molar mass of a gas that diffuses three times faster than oxygen under similar conditions.