Atomic number - 25
Symbol-Mn
54.938044u + 0.0003u
Answer : The emperical formula of hydrocarbon is 
.
Solution : Given,
Mass of 
= 11.1 g
Mass of 
= 5.11 g
Step 1 : convert given mass in moles.
Moles of = 
= 
= 0.2522 moles
Moles of = moles of C = 0.2522 moles
Moles of = = 
= 0.2838 moles
Moles of = moles of H = 0.2838 × 2 = 0.5677 moles
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = 0.2522/0.2522 = 1
For H = 0.5677/0.2522 = 2.25
C : H = 1 : 2.25
To make the ratio as a whole number multiply numerator and denominator by 4.
Ratio of C : H = 
= 4 : 9
The mole ratio of the element is repersented by subscripts in emperical formula.
Therefore, the Emperical formula =
The substances that are formed by a chemical change are called the product.
While the state of matter in which a material has a definite volume and a definite shape is the solid.
In a chemical reaction, the reactant on the left hand side undergoes a chemical change and gives product.
While in a solid state, a material has a definite volume and a definite shape is the solid.
Answer: Rotation occurs at single bonds that are sigma bonds. Rotational barrier is the amount of activation energy required to covert rotamer to another by rotation that occurs around the sigma bond(C-C single bond). Due to the presence of steric hindrance that is the nonbonding interaction effects the reactivity of ions and molecules, activation energy increases. So the rotational barrier in butenyl cation is high.
Size of a sodium ion is smaller than a sodium atom.
