Given that the mass of coffee in the cup = 140 g
Final temperature =
Initial temperature =
Let us assume the specific heat of coffee is equal to that of water = 4.184
Temperature change = T(final) - T(initial) = (20 - 75 )
=- 55
-Heat given out by coffee = heat absorbed by the surroundings
Heat released into the surroundings =-()
=
= 32,217 J
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Hope u derived something from this
Thanks
Answer:
Conduction is a process by which heat is transferred from the hot area of a solid object to the cool area of a solid object by the collisions of particles. In other words, in solids the atoms or molecules do not have the freedom to move, as liquids or gases do, so the energy is stored in the vibration of atoms.
[Co(CN)₆]³⁻ → Yellow
[Co(NH₃)₆]³⁺ → Orange
[CoF₆]³⁻ → Blue
Explanation:
- All the given compounds have octahedral geometry but the ligand in each are different with the same metal ion.
- Ligands strength order: CN⁻ > NH₃ > F⁻
- The ligand CN will act as a strong field ligand so that the splitting is maximum when compared to NH₃ and F⁻
- If the splitting is more, the energy required for transition is more, and the wavelength is inversely proportional to energy.
- So CN complex will absorb at lower wavelength (yellow color)
Answer:
0.38 moles He
Explanation:
from the ideal gas law PV= nRT you can calculate the volume of 1 mole at STP (273..1K and 1 atm of pressure) the MOLAR VOLUME IS
22.4 L
In the problem you have 8.4L
8.4 L/22.4 L=0.375 moles
so
0.38 moles He