How Can the Temperature of Heat Energy from Water Formation Be Measured?

[Butterfly_grl]

If I have amount of hydrogen and Oxygen combined together after a reaction it will produce water and heat. How can I measure the temperature of this heat energy?

Now.I have
1) heat capacity (Cth) of H2 and O2.
2) the mass (m) of H2 and O2 combined together (in moles and grams)
3) Heat energy (Qth) of this process

I tried

Qth = m Cth + delta (tC)

but that just gives me the difference in temperature ...

Could you please explain if I have something missing and Could you illustrate with an example.

thanks

 

[Astronuc]

The reactants 2H₂ + O₂ combine to form the product 2H₂O. So one would need the heat capacity of H₂O.

What is the starting temperature of the H₂ and O₂?

Q = m c_P ∆T, where ∆T = T_f - T_i.

 

[astrokreng]

I understand your question and I will do my best to provide a response. First, let's define some key terms to make sure we are on the same page. Temperature is a measure of the average kinetic energy of a substance, while heat energy is the total amount of energy transferred due to a temperature difference. In your example, the heat energy is being produced by the reaction between hydrogen and oxygen, resulting in the formation of water.

To measure the temperature of the heat energy produced in this reaction, you would need to use a thermometer. This device measures the temperature of a substance by detecting changes in the volume or pressure of a liquid or gas. However, it is important to note that the temperature measured by a thermometer may not be the same as the actual heat energy produced by the reaction. This is because the heat capacity (Cth) of a substance, which you have mentioned in your question, can affect the temperature change.

The equation you have used, Qth = m Cth + delta (tC), is known as the heat equation and is used to calculate the amount of heat energy transferred during a process. In this case, m represents the mass of the reactants (hydrogen and oxygen) and delta (tC) represents the change in temperature. However, this equation does not take into account the heat capacity of the substances involved, which can affect the temperature change.

To illustrate this, let's say we have 1 mole of hydrogen (H2) and 1 mole of oxygen (O2) reacting to form 2 moles of water (H2O). The heat capacity of H2 is 28.8 J/mol K and the heat capacity of O2 is 29.4 J/mol K. Using the heat equation, we can calculate the heat energy produced by this reaction:

Qth = (1 mol H2 + 1 mol O2) * (28.8 J/mol K + 29.4 J/mol K) * delta (tC)

= 58.2 J/mol K * delta (tC)

If we assume that the temperature change (delta (tC)) is 10 degrees Celsius, then the heat energy produced would be 582 J. However, if we take into account the heat capacity of the resulting water (75.3 J/mol K), the actual temperature change would be slightly lower than 10 degrees Celsius. This is because some of the heat energy produced