We write DE = q+w, where DE is the internal energy change and q and w are heat and work, respectively.
(b)Under what conditions will the quantities q and w be negative numbers?
q is negative when heat flows from the system to the surroundings, and w is negative when the system does work on the surroundings.
As an aside: In applying the first law, do we need to measure the internal energy of a system? Explain.
The absolute internal energy of a system cannot be measured, at least in any practical sense. The internal energy encompasses the kinetic energy of all moving particles in the system, including subatomic particles, as well as the electrostatic potential energies between all these particles. We can measure the change in internal energy (DE) as the result of a chemical or physical change, but we cannot determine the absolute internal energy of either the initial or the final state. The first law allows us to calculate the change in internal energy during a transformation by calculating the heat and work exchanged between the system and its surroundings.
100°C is 273 kelvins.
1°C is 2.73 kelvins.
I guess the closest would be north pole
Answer:
They all end up in the oceon
Explanation:
Answer:
[H₂SO₄] = 0.255M
Explanation:
H₂SO₄ + 2KOH => K₂SO₄ + 2H₂O
2(M x V)acid = (M x V)base => M(acid) = (M x V)base /2·Vacid
[H₂SO₄] = (0.5M)(25.5ml)/2(25.0ml) = 0.255M
Answer:
4.88 x 10²⁴atoms
Explanation:
Given parameters:
Number of moles of oxygen = 8.1moles
Problem:
To find the number of atoms in 8.1moles of oxygen.
Method in solving the problem:
We know that a mole of a substance contains Avogadro’s number of particles which is 6.02 x 10²³
The particles can be molecules, atoms, etc.
Solution:
From the concept of mole,
Number of atoms =
number of moles x 6.02 x 10²³
Number of atoms = 8.1 x 6.02 x 10²³
Number of
atoms of oxygen = 48.8 x 10²³ atoms
= 4.88 x 10²⁴atoms
