×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

# Contact US

Log In

#### Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
To Your Posts
• Keyword Search
• One-Click Access To Your
Favorite Forums
• Automated Signatures
On Your Posts
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

# Help with chemistry question?

 Forum Search FAQs Links MVPs

## Help with chemistry question?

(OP)
A question has been proposed in my CHM class.  I believe I have the answer but just wnated to rund it by the experts for varification.

Question:  As a purity check for industrial diamonds, a 10.25 carat diamond is heated to 74.21 degree C and immersed in 26.06 g of water in a constant-pressure calorimeter (1 carat = 0.2000 g).  The initial temperature of the water is 27.20 degree C.  Calculate delta T, of the water and the diamond ( C diamond = 0.519 J/g. K.)

My answer:
I assumed STP. In making this assumption, the delta T of water is 2.2 degress C.
The delta T of the diamond is 49.21 degrees C.

Does this seem to be resonable?  For this problem, can it be just that simple???

Thanks in advance for any inputs!

### RE: Help with chemistry question?

If I have understood you correctly:
The system (water+diamond) does not exchange any energy with the surroundings - the change in energy from start to finish equals zero.
At equilibrium the system will have the temperature Teq.

Thus,
2.05 g * 0.519 J/gK * (74.21°C - Teq) + 26.06 g * 4.18 J/gK * (27.2°C - Teq) = 0

Solve for Teq.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

### Reply To This Thread

#### Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!

Already a member? Close this window and log in.