• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Chemistry question - moles and thermochemistry

J

jobberd

Banned
0.24 grams of a magnesium ribbon were placed in 50 ml of aqueous HCl. the initial temperature was 20 Celsius, while the final temperature was 42 Celsius. According to the teacher, all calculations must be done with the density (1 ml = 1 g) and specific heat capacity (4.18) of water, and not HCl. how are you supposed to find out the quantity of heat (q) in joules transferred?
ive been working on this forever, and i can't get it :/ please help, if you can!
 
Ouch.... Chemistry really sucks.
I would bust out my book from last year and help you, but I'm too lazy😀

If you don't get it after a little while I'll try and help you some.
 
Any links would help too. all i need to know is how to determine the quantity of heat transferred in a reaction, when mass of reactants and temperature change is known
 
btw mole day was June 22
Click to expand...
no, it was october 23. My chem teacher said they have fireworks or something at 6:02 am. (6.02x10^23)


Q=(grams)(specific heat)(delta temperature)

q=50*4.18*22
q=4598
Click to expand...

how are you getting the grams to be 50? shouldnt you write out the reaction mg+HCl+H2O arrow mgcl... and getting the moles of mg and get the grams of the water at the end of the reaction and use those grams for the m in q=mct?
 
how are you getting the grams to be 50? shoudnt you add the .24 grams of magnesium or something? shouldnt you write out the reaction mg+HCl+H2O arrow mgcl... and getting the moles of mg and get the grams of the water at the end of the reaction and use those grams for the m in q=mct?
Click to expand...
You're right, thanks a bunch! and thanks to the rest of you too, you were all a big help 🙂
 
Originally posted by: Bobomatic
how are you getting the grams to be 50?
Click to expand...

thats how we did it a few weeks ago for my ap chem class. the thing being heated is the 50ml/g of water, not the Mg. we did not do anything with the moles of anything the way we did it (until we found the J/mol)
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top