The mechanism will include a) A slow step, which is the rate-determining step In this phase, the leaving group (chloride ion) departs from the substrate, forming carbocation b) A fast step: The nucleophile will interact with the cation, resulting in the substituted product. This mechanism is depicted as follows:
An element of evidence indicating that the color of the flame is attributed to the metal ion rather than the chemical is that none of the flames produced by different metals shared the same color (each metal produced its unique flame color). Although most tested metals had chloride, the flame colors were all distinct. The two flames that contained copper (one from copper (II) chloride and the other from copper (II) sulfate) showed similar colors; one was green-blue and the other was bright green. This suggests a close resemblance, and any slight variation could be attributed to error.
Answer: The molecular formula will be 
Explanation:
When percentages are provided, we assume the total mass to be 100 grams.
Thus, the mass of each element corresponds to the specified percentage.
Mass of C= 70.6 g
Mass of H = 5.9 g
Mass of O = 23.5 g
Step 1: convert given masses to moles.
Moles of C =
Moles of H =
Moles of O =
Step 2: For determining the mole ratio, divide each molar amount by the smallest number of moles calculated.
For C = 
For H = 
For O =
The resulting ratio of C: H: O= 4: 4: 1
Hence, the empirical formula obtained is 
The empirical weight is calculated as
= 4(12)+4(1)+1(16)= 68g.
The molecular weight = 136 g/mole
Now the molecular formula needs to be obtained.

The molecular formula can be derived as=
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.