1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sergeu [11.5K]
3 years ago
5

A cylinder with a movable piston contains 2.00 gg of helium, HeHe, at room temperature. More helium was added to the cylinder an

d the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 LL to 3.90 LL ? (The temperature was held constant.)
Physics
2 answers:
bezimeni [28]3 years ago
8 0

Answer:

The grams of helium added is 1.9 g

Explanation:

According to the ideal gas expression and due pressure, volume and temperature are constant, we have that V/n = constant

The number of moles is:

\frac{V_{1} }{n_{1} } =\frac{V_{2} }{n_{2} } \\\frac{2}{0.5} =\frac{3.9}{n_{2}} \\n_{2}=0.975moles

The moles of He added is:

nHe = 0.975 - 0.5 = 0.475 moles

The mass of He added is

mHe = 0.475 * 4 = 1.9 g

NikAS [45]3 years ago
3 0

Answer: 1.8 g

Explanation:

We start first, by calculating the amount of Helium

n = m/M

m = mass of Helium

M = molar mass if Helium

n = 2/4 = 0.5 moles

proceeding further, we use ideal gas law. PV = nRT

Then we have

P1V1/n1T1 = P2V2/n2T2

So that,

n2 = n1T1P2V2/P1V1T2

From the question, we know that, P1 = P2, and T1 = T2. So that,

n2 = n1v2/v1

n2 = (0.5 * 3.9) / 2

n2 = 1.95/2

n2 = 0.975 moles. With this, we can determine the mass, m2 of Helium

n = m/M

m = n * M

m = 0.975 * 3.9

m = 3.8

The difference between both masses are 3.8 - 2 = 1.8 g

Thus, 1.8 g of Helium was added to the cylinder

You might be interested in
A 2kg watermelon is dropped from a 4m tall roof a) use the appropriate kinematic equations to determine the instantaneous veloci
Ivenika [448]

Answer:

8.85m/s

Explanation:

The potential energy the watermelon held before dropping is Ep=mgh=2*9.8*4=78.4J.

When it strikes the ground, all of its Ep will transfer into Ek, so 1/2*m*v^2=78.4.

We already knew that m=2, so insert that in, we will get the V^2=78.4 m/s, V=8.85 m/s

6 0
3 years ago
How much Gravitational Potential Energy does a 1.48 kg book at rest on top of a 2.4 m tall desk have?
Naily [24]

Gravitational Potential Energy GPE = mg∆h. 12. A 5.0 kg mass is initially sitting on the floor when it is lifted onto a table 1.15 meters high at.

4 0
2 years ago
Determine the minimum applied force p required to move wedge a to the right. the spring is compressed a distance of 175 mm. negl
BARSIC [14]
<span>b. The coefficient of static friction for all contacting surfaces is μs=0.35. neglect friction at the rollers.

</span>
6 0
3 years ago
Why are circuit breakers and fuses important?
Lesechka [4]

Answer:

A fuse and circuit breaker both serve to protect an overloaded electrical circuit by interrupting the continuity, or the flow of electricity. ... Fuses tend to be quicker to interrupt the flow of power, but must be replaced after they melt, while circuit breakers can usually simply be reset.

6 0
3 years ago
What kind of symmetry do you have
Keith_Richards [23]
During the daytime, I have mostly line symmetry.

During the night, I often have almost spherical symmetry.
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following statements best characterizes the surface of the planet Mars?The surface of Mars is continuously resurfac
    14·1 answer
  • An astronaut's training centrifuge has a radius of 4.0m. If it goes round once every 2.5s, calculate the velocity of the end of
    9·1 answer
  • What's the speed of a sound wave through water at 25 Celsius
    9·1 answer
  • Determine the force between two long parallel wires, that are separated by a dis- tance of 0.1m the wire on the left has a curre
    14·1 answer
  • he "escape velocity from Earth (the speed required to escape Earth's gravity) is 2.5 x 10 miles per hour. What is this speed in
    14·1 answer
  • A baseball player hits a 140 g baseball with a force of 2800 N. What is the
    15·1 answer
  • Here is extra free p-o-i-n-t-s hope yall have a wonder full day!
    9·2 answers
  • HURRY ILL GIVE 15 POINTS
    12·1 answer
  • PLS ANSWER REAL ANSWERS ONLY
    6·1 answer
  • A domestic water heater holds 189 L of water at 608C, 1 atm. Determine the exergy of the hot water, in kJ. To what elevation, in
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!