Problem: As shown here, one type of computer keyboard cleaner contains liquefied 1,1-difluoroethane (C2H4F2), which is a gas at atmospheric pressure. When the nozzle is squeezed, the 1,1-difluoroethane vaporizes out of the nozzle at high pressure, blowing dust out of objects.Defining the 1,1-difluoroethane as the system, do you expect qsys for the process to be positive or negative?

FREE Expert Solution

We are asked to determine if the qsys of 1,1-difluoroethane as the system is positive or negative.

 The relationship between internal energy, heat, and work is shown in the following equation:

U=q+w

ΔU = internal energy, J
q = heat, J
w = work, J

82% (344 ratings)
View Complete Written Solution
Problem Details

As shown here, one type of computer keyboard cleaner contains liquefied 1,1-difluoroethane (C2H4F2), which is a gas at atmospheric pressure. When the nozzle is squeezed, the 1,1-difluoroethane vaporizes out of the nozzle at high pressure, blowing dust out of objects.
A canister contains liquefied C2H4F2, which leaves the spray nozzle as vaporized C2H4F2.

Defining the 1,1-difluoroethane as the system, do you expect qsys for the process to be positive or negative?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Internal Energy concept. You can view video lessons to learn Internal Energy. Or if you need more Internal Energy practice, you can also practice Internal Energy practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor McCarty's class at NCSU.