How do you measure something in enthalpy units?
Quick Answer
To measure something in enthalpy units, use a calorimeter to measure the change of the heat in a chemical reaction. Add chemicals to the calorimeter's constant pressure system.
Continue ReadingFull Answer
- Prepare the calorimeter
Clean the calorimeter, and dry it well. Weigh the empty calorimeter on a scale. Put 10 centimeters of magnesium ribbon in the calorimeter, and weigh it again. Take the mass to 0.001 grams.
- Measure the hydrogen chloride
Pour 50 centimeters-cubed into a cylinder. Find the temperature once every minute for four minutes.
- Add the hydrogen chloride to the calorimeter
Pour the hydrogen chloride into the calorimeter, and shut the lid. Stir the mixture constantly. Drop the thermometer in the calorimeter every 30 seconds for seven minutes. Record each temperature on a sheet of paper.
- Graph the temperatures
Plot the changes in temperature over time from the start of the experiment to the final temperature calculation.
- Calculate the enthalpy
Solve the equation Q = M.HCl C.HCl(Tf - Ti), where (C.HCl = 4.00JK ^ -1 x g ^ -1). The Q in the equation stands for the heat required to change the temperature of the substance. Tf stands for the first recorded temperature. Ti stands for the final recorded temperature. Plug the variable numbers into the equation. Convert the variables to kilojoules per mole. The answer represents the enthalpy units of the temperature changes of the substance.
Related Questions
-
Q:
What is the process by which hand warmers work?
A: Hand warmers work by creating an exothermic chemical reaction that produces heat when the contents react with air or each other. Most commonly, hand warmer... Full Answer >Filed Under: -
Q:
What is the standard enthalpy of reaction?
A: The standard enthalpy of reaction denotes the heat lost or gained during a chemical reaction when one molar mass of a substance reacts under standard condi... Full Answer >Filed Under: -
Q:
How does ammonium nitrate dissolve in water?
A: Ammonium nitrate dissolves in water with an endothermic reaction, a chemical reaction that consumes heat rather than releasing it. The temperature of the s... Full Answer >Filed Under: -
Q:
How do you explain the principle of explosion?
A: Explosions consist of a chemical reaction or a series of reactions in which a substance burns or decomposes very quickly, almost instantaneously, producing... Full Answer >Filed Under:
