Homework Help: chem

Posted by tomi on Wednesday, October 8, 2008 at 5:29pm.

A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g of X(a substance with a molar mass of 46.0g/mol) is added, it dissolves via the reaction

X(s)+H20(l)->X(aq)
and the temperature of the solution increases to 25.0degrees celsius.
Calculate the enthalpy change for this reaction per mole of X.

Assume that the specific heat and density of the resulting solution are equal to those of water [4.18j/g*C and 1.00g/ml] and that no heat is lost to the calorimeter itself, nor to the surroundings.

chem - bobpursley, Wednesday, October 8, 2008 at 5:32pm
find the heat evolved:

heatevolved=totalmass*specificheat*deltatemp

Now, divide that heat by the number of moles of X you had, and you have the enthalpy change per mole.

Answer this Question

Related Questions

chemistry - Substance x has a molar mass of 107.6 g/mol. when 2.50 g of ...
Calorimetry - A calorimeter contains 21.0 mL of water at 12.0 degress Celsius. ...
chemestry - A calorimeter contains 16.0 of water at 15.0. When 1.60 of (a ...
Chemistry - A calorimeter contains 21.0 mL of water at 14.0 degreesC. When 1.90 ...
Chemistry - A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X...
Chemistry - A coffee-cup calorimeter initially contains 125 g water at 24.2 ...
Chemictry - A calorimeter contains 32.0 of water at 11.5. When 1.70 of (a ...
ap chem - A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a ...
chemistry - substance X has a molar mass of 107.6 g/mol. When 2.50 g of ...
Chemistry - A calorimeter contains 30.0 mL of water at 11.0 degrees C. When 1.50...

For Further Reading

First Name:
School Subject:
Answer: