How Do You Calculate the Change in Internal Energy for Hydrogen Gas?

In summary, the problem involves finding the change in internal energy of one mole of hydrogen gas when heated from 278 K to 390 K at constant pressure. The specific heat of hydrogen is 43.6 J/mol*K and the universal gas constant is 8.31451 J/K mol. Using the formula (1.5)(1 mol)(8.31451 J/K mol)(112 K), the answer is calculated to be 1396.83768 J, but the website may require a different number of significant figures.
  • #1
alexithymia916
9
0

Homework Statement


One mole of hydrogen gas is heated from 278 K to 390 K at constant pressure. Hydrogen has a specific heat of 43.6 J/mol*K. The universal gas constant is 8.31451 J/K mol. Calculate the change in the internal energy of the gas. Answer in units of J


Homework Equations



Change in Internal energy = (1.5)nRT
n= number of moles
R= universal gas constant
T= change in temperature

The Attempt at a Solution


(1.5)(1 mol)(8.31451 J/k mol)(112 K)
=
1396.83768

what am i doing wrong??
the website i have to submit my homework to says it's incorrect...:eek:
 
Physics news on Phys.org
  • #2
I think that's right... You may want to look at the significant figures though.
 
  • #3
noo def not
my teacher HATES significant digits, so we're just supposed to carry it out about 5 decimal places
grr i can't figure this one out :(
 

What is change in internal energy?

Change in internal energy refers to the difference in energy of a system before and after a process or reaction. It is a measure of the heat transferred or work done on or by the system.

What factors affect change in internal energy?

The change in internal energy of a system is affected by the amount of heat transferred, the work done on or by the system, and the initial and final temperatures of the system.

How is change in internal energy calculated?

The change in internal energy can be calculated using the equation ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat transferred, and W is the work done on or by the system.

What are some examples of processes that result in change in internal energy?

Some examples of processes that result in change in internal energy include chemical reactions, phase changes, and expansion or compression of gases.

How does change in internal energy relate to the first law of thermodynamics?

The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or converted. Change in internal energy is a manifestation of this law as it represents the transfer or conversion of energy within a system.

Similar threads

Internal Energy of an Ideal Gas
    • Introductory Physics Homework Help
Replies
4
Views
1K
Deriving an expression for change in internal energy
    • Introductory Physics Homework Help
Replies
5
Views
812
What is the change in internal energy after two processes?
    • Introductory Physics Homework Help
Replies
10
Views
1K
Internal energy won't add up to 0 in cyclic process
    • Introductory Physics Homework Help
Replies
1
Views
176
Calculating Entropy Change for Gas Sample with Helium and Ideal Gas Equation
    • Introductory Physics Homework Help
Replies
1
Views
1K
Thermodynamics: calculating work question
    • Introductory Physics Homework Help
Replies
6
Views
1K
What is the Internal Energy of 158 moles of CO2
    • Introductory Physics Homework Help
Replies
3
Views
3K
Internal energy in ideal gas
    • Introductory Physics Homework Help
Replies
1
Views
864
Calculating Internal Energy & Temperature Change of Ideal Gas
    • Introductory Physics Homework Help
Replies
1
Views
1K
Calculating Hydrogen Mass from Ideal Gas Law
    • Introductory Physics Homework Help
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top