Calculate the enthelpy of the reaction

  • Thread starter a.a
  • Start date
  • Tags
    Reaction
In summary, the conversation discusses a lab experiment involving the reaction between calcium and water in an ice calorimeter. The volume of water decreased by 0.18 mL during the reaction. The task at hand is to write the reaction equation and determine whether it is a redox reaction. The second part involves calculating the enthalpy of the reaction in kJ/mol, with the given formula m = delta Volume * (-11.05). The person has successfully completed part a but is struggling with part b and is unsure of where to start. They have identified m as -0.18 mL and are seeking guidance on how to proceed with finding the enthalpy.
  • #1
a.a
127
0

Homework Statement



The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction
a) Write the equation for the reaction which occurs. Is it a redox reaction?
b) Calculate the enthalpy of the reaction (in kJ/mol). Show all steps of calculation.


Homework Equations



it was given on the previous page that m = delta Volume * (-11.05)

The Attempt at a Solution



I got part a, but I am having a lot of trouble with part b. I am not even sure where to start.

m = (-.18)(-11.05) = 2.0

Where do we go form here, to find the enthalpy?
 
Physics news on Phys.org
  • #2


What is m?
 
  • #3


mass
 
  • #4


Mass of what?
 

1. What is enthalpy?

Enthalpy is a thermodynamic property of a system that describes the amount of energy that is either absorbed or released during a chemical or physical reaction.

2. How is enthalpy calculated?

The enthalpy of a reaction is calculated by subtracting the enthalpy of the reactants from the enthalpy of the products. This can be done using Hess's Law or by using enthalpy data from a thermodynamic table.

3. What is the unit of measurement for enthalpy?

The standard unit of measurement for enthalpy is Joules (J) in the International System of Units (SI).

4. How does temperature affect the enthalpy of a reaction?

The enthalpy of a reaction is affected by temperature through the change in heat energy. As temperature increases, the kinetic energy of molecules increases, resulting in a higher enthalpy of the reaction.

5. Can the enthalpy of a reaction be negative?

Yes, the enthalpy of a reaction can be negative if the reaction is exothermic, meaning that it releases heat energy. This indicates that the products have a lower enthalpy than the reactants.

Similar threads

Constant pressure heat of reaction -> constant volume q
    • Biology and Chemistry Homework Help
Replies
3
Views
5K
Calculating Delta-H for a Reaction using a Coffee-Cup Calorimeter Method
    • Biology and Chemistry Homework Help
Replies
3
Views
4K
Chemistry Thermochemistry and the heat of complete combustion
    • Biology and Chemistry Homework Help
Replies
4
Views
1K
Stuck on Reaction Enthelpy Question
    • Biology and Chemistry Homework Help
Replies
7
Views
2K
How to calculate heat from enthelpy of reaction
    • Biology and Chemistry Homework Help
Replies
5
Views
2K
How much energy will be released?
    • Biology and Chemistry Homework Help
Replies
1
Views
1K
Calculate the molar enthelpies of reaction occuring in parts A and B
    • Biology and Chemistry Homework Help
Replies
1
Views
7K
Percentage yield in a reaction problem
    • Biology and Chemistry Homework Help
Replies
4
Views
2K
Enthelpy change of a neutralisation reaction
    • Biology and Chemistry Homework Help
Replies
3
Views
2K
How do I calculate the enthelpy of formation using combusion data
    • Biology and Chemistry Homework Help
Replies
9
Views
5K

Hot Threads

Recent Insights

Back
Top