When the season changes and a bird migrates, the bird is responding to which of these?
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Taking into account the definition of calorimetry ans sensible heat, you need a heat of 38.72 kJ to raise the temperature of 400 g of ethanol from 20 °C to 60 °C.
<h3>What is calorimetry and sensible heat</h3>Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where
- Q is the heat exchanged by a body of mass m.
- c is the specific heat substance c.
- ΔT is the temperature variation.
In this case, you know:
- Q= ?
- c= 2.42
- m= 400 g
- ΔT= Tfinal - Tinitial= 60 °C - 20 °C= 40 °C
Replacing in the definition of sensible hear:
Q = 2.42 × 400 g× 40 °C
Solving:
<u><em>Q= 38,720 J= 38.72 kJ</em></u>
Finally, you need a heat of 38.72 kJ to raise the temperature of 400 g of ethanol from 20 °C to 60 °C.
Learn more about sensible heat:
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These are three questions.
Answer:
- Question 1) Find Kc at 25°C: 617
- Question 2) Find [H₂] at 340°C: <u>0.352 M </u>
- Question 3) Find [HI] at 445°C: <u>0.342 M</u>
Explanation:
I will start by copying the table for better understanding of the data and the work to do.
T(∘C) [H2] [I2] [HI] [Kc]
25 0.0355 0.0388 0.922 -
340 4.60×10⁻²M 0.394M 9.6
445 4.90×10−2M 4.76×10⁻²M − 50.2
The chemical equation that represents the equilibrium is also given:
- H₂ (g) + I₂(g) ⇄ 2HI(g)
From that equilibrium equation, you can fnd the expression of the equlibrium constant, Kc, as:
The calculations and explanations to answer the three questions are in the pdf file attached.
Please, click on the image of the file to open it.