Answer:
Here's ya idea: Can the food we eat affect our heart rate?
Explanation:
Hello!
We have the following data:
v (volume) = ? (in L)
n (number of mols) = 1,5 mol
T (temperature) = 22 ºC
First let's convert the temperature on the Kelvin scale, let's see:
TK = TºC + 273,15
TK = 22 + 273,15
TK = 295,15
P (pressure) = 100 kPa → P = 100000 Pa → P ≈ 0,987 atm
R (gas constant) = 0,082 atm.L / mol.K
<span>We apply the data above to the Clapeyron equation (gas equation), let's see:
</span>
![P*V = n*R*T](https://tex.z-dn.net/?f=P%2AV%20%3D%20n%2AR%2AT)
![0,987*V = 1,5*0,082*295,15](https://tex.z-dn.net/?f=0%2C987%2AV%20%3D%201%2C5%2A0%2C082%2A295%2C15)
![0,987V = 36,30345](https://tex.z-dn.net/?f=0%2C987V%20%3D%2036%2C30345)
![V = \dfrac{36,30345}{0,987}](https://tex.z-dn.net/?f=V%20%3D%20%20%5Cdfrac%7B36%2C30345%7D%7B0%2C987%7D%20%20)
I hope this helps. =)
Answer:
There are
moles of bactoX present in a 3.0 μL sample volume that contains 7.512×106 bacterial cells
Explanation:
Given that:
The number of molecules present in one bacterial cell is
molecules
and the sample contains
molecules.
Number of moles = number of molecules /Avogadro's number
where;
Avogadro's number = 6.023 × 10²³
Number of moles = ![\dfrac{7.140 \times 10^3}{6.023 \times 10^{23}}](https://tex.z-dn.net/?f=%5Cdfrac%7B7.140%20%5Ctimes%2010%5E3%7D%7B6.023%20%5Ctimes%2010%5E%7B23%7D%7D)
Number of moles =
moles
So;
moles is present in one bacteria cell
Similarly; the sample contains
molecules.
Therefore; the number of moles present in the bactoX is = ![1.185 \times 10^{-20} \times 7.512 \times 10^6](https://tex.z-dn.net/?f=1.185%20%5Ctimes%2010%5E%7B-20%7D%20%5Ctimes%207.512%20%5Ctimes%2010%5E6)
=
moles
1. Endothermic reaction
2. Exothermic reaction
3. Exothermic reaction
<u>Explanation:</u>
1. Evaporation of alcohol from the skin, here the heat is absorbed by the alcohol so that it gets evaporated from the skin and it is an endothermic process. As the reaction says that, the energy is added to the system, so it is endothermic.
C₃H₈O + 5.2 kJ → C₃H₈O(g)
2. Burning of propane in a gas grill:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O + 1652 kJ.
Here energy is released or given out which is termed as exothermic reaction.
3. Oxidation of iron to form rust:
4 Fe + 3O₂ → 2 Fe₂O₃ + 2221 kJ.
Here also energy is released along with the products, so it is termed as exothermic reaction.
Whenever energy is absorbed, the reaction is endothermic in contrast if the energy is released then the reaction is exothermic.