Answer:
see explanation
Explanation:
#Atoms = (mass/atomic wt) x 6.02 x 10²³
- mass is grams
- atomic weight is grams/mole
- 6.02 x 10²³ is atoms/mole
You are looking for an element in the fourth period and a transition metal. As most have about 3 valence electrons. Gallium and Scandium work perfectly.
Answer:
protons
Explanation:
the number of protons in 1 atom determine the identity
Given that,
Work done by the system = 125 J
Energy released when it cools down = 438 J
To find,
The change in internal energy.
Solution,
As heat is released by the system, Q = -438 J
Work done by the system, W = -125 J
Using the first law of thermodynamics. The change in internal energy is given by :

So, the change in internal energy is 563 J.
Answer:
All of the above
Explanation:
Their all chemical change