Log in
Chemistry
1
answer
0
watching
123
views

A sample of an alpha emitter having an activity of 0.18 Ci is stored in a 25.0-mL sealed container at 22 °C for 245 days. (a) How many alpha particles are formed during this time? (b) Assuming that each alpha particle is converted to a helium atom, what is the partial pressure of helium gas in the container after this 245-day period?

Watch
1
answer
0
watching
123
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Trinidad Tremblay
Trinidad TremblayLv2
22 May 2020

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
discord banner image
Join us on Discord
Chemistry Study Group
Join now

Related textbook solutions

Basic Chemistry
5 Edition,
Timberlake
ISBN: 9780134138046
Principles of Chemistry Molecular Approach
4th Edition,
Tro
ISBN: 9780134112831
Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944
Chemistry: Structure and Properties
2nd Edition,
Tro
ISBN: 9780134293936
Chemistry: A Molecular Approach
3rd Edition,
Tro
ISBN: 9780321809247
Chemistry: A Molecular Approach
5th Edition,
Tro
ISBN: 9780134874371
Principles of Chemistry: A Molecular Approach
4th Edition,
Tro
ISBN: 9780134895741
Chemistry: The Central Science
14th Edition, 2017
Brown
ISBN: 9780134414232

Related questions

1.18

part A) If the partial pressure of oxygen drops below 110 mmHg , passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?

part B) A sample of gas in a cylinder as in the example in Part A has an initial volume of 42.0 L , and you have determined that it contains 1.70 moles of gas. The next day you notice that some of the gas has leaked out. The pressure and temperature remain the same, but the volume has changed to 10.5 L . How many moles of gas (n2) remain in the cylinder?

1 21 a) A very flexible helium-filled balloon is released from the ground into the air at 20. ∘C. The initial volume of the balloon is 5.00 L, and the pressure is 760. mmHg. The balloon ascends to an altitude of 20 km, where the pressure is 76.0 mmHg and the temperature is −50. ∘C. What is the new volume, V2, of the balloon in liters, assuming it doesn't break or leak?

b) Consider 5.00 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.40 L and the temperature is increased to 34 ∘C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder.

Question 11 pts

Which general statement about gases is NOT correct?

The molecules of a pure gas are distributed evenly throughout the container.
Gases are much less dense than liquids or solids
Molecules in a gas mixture can form layers according to their densities
Gases can be compressed, even to the point of liquefaction

Flag this Question

Question 21 pts

Which example is the greatest pressure?

1.00 atm
101 kPa
760 mm Hg (= 760 torr)
All of the above pressures are equal.

Flag this Question

Question 31 pts

Which example is the greatest pressure?

850 mm Hg (= 850 torr)
1.5 atm
All of the above pressures are equal.
96 kPa

Flag this Question

Question 41 pts

Assuming all other variables are held constant, a graph of which of the following will NOT yield a straight line?

P vs. V
V vs. T
P vs. T
V vs. n

Flag this Question

Question 51 pts

A sealed vessel contains 0.250 mol of oxygen gas. Which of the following will result in a decrease in the pressure of the oxygen gas?

increasing the number of moles of oxygen
increasing the temperature of the vessel
increasing the volume of the vessel
adding some helium to the vessel

Flag this Question

Question 61 pts

According to Charles’s law, which change will cause the pressure of a gas to double? Pressure and amount of gas are constant.

The temperature decreases from 650 K to 325 K.
The temperature of the sample decreases from�88 °C to 44 °C.
The temperature of the sample increases from�22 °C to 44 °C.
The temperature of the sample increases from�250 K to 500 K.

Flag this Question

Question 71 pts

Which set of units for P, V, and T can be used for combined gas law calculations?

torr, L, and Kelvins
tm, g/L, and Kelvins
atm, mL, and degrees Celsius
inches of mercury, g/mL, and degrees Celsius

Flag this Question

Question 81 pts

The vapor pressure of a gas is

the atmospheric pressure at which the boiling point is determined.
the pressure at a Kelvin temperature exactly two times the boiling point.
impossible to determine experimentally without knowing the temperature and volume.
the pressure above a gas sample when evaporation and condensation are balanced.

Flag this Question

Question 91 pts

In a chemistry experiment where CO2 is collected over water, the atmospheric pressure is 755 mm. The partial pressure of water at the temperature in the lab is 24.2 mm. What is the pressure of the CO2?

779 mm
731 mm
More information is needed to answer this question
755 mm

Flag this Question

Question 101 pts

Which statement is NOT true according to the kinetic molecular theory of gases?

Molecules undergo elastic collisions
Molecules move in straight-line paths.
Molecules of different gases have different�kinetic energies at the same temperature
Molecules occupy a negligible volume.

Flag this Question

Question 111 pts

Which statement is NOT true according to the ideal
gas law?

At constant P & T, V must increase when n increases.
At constant V & T, P must decrease when n decreases.
At constant V & n, P must increase when T increases.
At constant P & n, V must decrease when T increases

i need answers of all the 12 questions. plz provide steps as well

Weekly leaderboard

Home
Homework Help 3,900,000
Chemistry 830,000
Start filling in the gaps now
Log in