Chemical Forums
1 Hour
1 Day
1 Week
1 Month
Forever
December 09, 2024, 10:44:25 AM
Forum Rules
: Read This Before Posting
Home
Help
Search
Login
Register
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
a basic phase change problem
« previous
next »
Print
Pages: [
1
]
Go Down
Topic: a basic phase change problem (Read 3941 times)
0 Members and 1 Guest are viewing this topic.
helpmeimnoob
New Member
Posts: 4
Mole Snacks: +0/-0
a basic phase change problem
«
on:
January 01, 2008, 11:16:37 PM »
Ok, its winter break and I totally forgot how to do chemistry problems from last year so can you remind me how to do this problem?
How many joules does it take to heat 50.0 grams of water at 0.0 degrees celceus to 50.0 degrees celceus?
Logged
Alpha-Omega
Full Member
Posts: 693
Mole Snacks: +360/-231
Gender:
Physical Inorganic Chemist
Re: a basic phase change problem
«
Reply #1 on:
January 01, 2008, 11:31:58 PM »
OK you have 50.0 g H2O
To = 0.00 C
Tf = 50.0 C
What is the specific heat of water? (get it from a table in your text book)
Heat(cal)= Mass(g) x T change in degrees C x specific heat (cal/g x degree c).
You will have to convert your calories to Joules. That iis also in a table in your text book.
GOOD LUCK!!!!!!!!!!!!!!!!!!!!!!
Logged
helpmeimnoob
New Member
Posts: 4
Mole Snacks: +0/-0
Re: a basic phase change problem
«
Reply #2 on:
January 01, 2008, 11:38:33 PM »
ok, wait cant i just do like..
specific heat of water (J/g x c) x 50g x 50 degrees c ?
Logged
Alpha-Omega
Full Member
Posts: 693
Mole Snacks: +360/-231
Gender:
Physical Inorganic Chemist
Re: a basic phase change problem
«
Reply #3 on:
January 01, 2008, 11:49:03 PM »
You sure can....since:
The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance.
BTW- there is a site on the web....that will allow you calculate these just by plugging in the variables.....check your answer here:
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/spht.html
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
Sponsored Links
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
a basic phase change problem