Answer: The correct choice is (b).
Explanation:
We have the mass of Magnesium at 97.22 g, and the molar mass of Magnesium is 24.305 g/mol.
Therefore, the calculation for the number of moles is as follows.
Number of moles = 
=
= 4 mol
Additionally, it is known that one mole contains
atoms/mol. Thus, we calculate the total number of atoms in 4 moles as follows.

=
atoms
or, =
atoms
Hence, we conclude that in 97.22 grams of Magnesium, there are
atoms.
Answer:
The correct option is C. 21900.3. I calculated 21945 J, which makes option C closely aligned with my result.
Explanation:
Data
mass = 150 g
initial temperature T1 = 10°C
final temperature T2 = 45°C
Cw = 4.18 J/g°C
Formula
Q = mCΔT = mC(T2 - T1)
Substitution
Q = (150)(4.18)(45 - 10)
Simplification
Q = (150)(4.18)(35)
Result
Q = 21945 J
The correct answer is the fifth option. Energy transfers from the fire to the pot, subsequently to the water, and then to the peas.