Alkene is the group of hydrocarbon molecules that contains at least one double bond. So, A, C and D would be named ending with -ene.
She would divide that mass of each element by it molar mass the answer is C <span />
C= comcentration
V= volume
C1*V1=C2*V2
3.5M*225.mL = xM*750 mL
x=(3.5*225/750) =1.05M≈1.1M
This is the chemical doula for salt which is a polyatomic anion very prevalent in out daily lives e.g.
Salts, acid derivatives, and peroxides of sulfate are widely used in industry.
The same number of protons.
Hope it helps!