M=6.58 g
ρ=0.7899 g/ml
v=m/ρ
v=6.58g/(0.7899g/ml)=8.33 ml
Answer:
b. hydride shift from C-3 to C-2.
Explanation:
Markovnikov's rule states that *in the addition of a protic acid HX or other polar reagent to an asymmetric alkene, the acid hydrogen (H) or electropositive part gets attached to the carbon with more hydrogen substituents, and the halide (X) group or electronegative part gets attached to the carbon with more alkyl substituents* (wikipedia).
This rule implies that the hydrogen of HBr will be attached to C-1 and the carbocation will be on C-2. Remember that the order of stability of carbocations is tertiary > secondary > primary > methyl. A hydride shift can yield a tertiary carbocation.
C-3 is a tertiary carbon atom. If the hydride on carbon 3 shifts to carbon 2, a tertiary and more stable carbocation is formed. This accounts for the major product in the reaction.
The atomic number of all isotopes of lithium is 3. The isotope doesn't matter because an isotope contains the same protons. All isotopes of a given element share the same atomic number
Answer:
5.65 ⋅ 10^17 photons.
Explanation:
Your strategy here will be to use the Planck - Einstein relation to calculate the energy of a single photon of wavelength
535 nm
, then use the total energy of the laser pulse to figure out exactly how many photons were needed to produce that output.