The C=O stretch appears as a very sharp and intense peak in an IR spectrum. Since, C=O is a double bond, it appears in the "double bond" region of the IR spectrum, which is typically in the 1500-2000 cm-1 range. More specifically, C=O generally falls in the range of 1650-1850 cm-1. The reason for the range is that there are many types of functional groups that contain a carbonyl (C=O), such as a ketone, aldehyde, amide, or ester. Each of these will have a slightly different value as each stretch will have a different energy due to various factors such as conjugation.
a. 1.05 x 10⁻³ mol
b. 0.155% w/v
<h3>Further explanation</h3>
Given
50 ml Ca(OH)₂
19.5 ml of 0.1059 N HCl
Required
Amount of Ca(OH)₂
The Ca(OH)₂ concentration in % w/v.
Solution
Titration formula :
M₁V₁n₁=M₂V₂n₂
or
N₁V₁=N₂V₂
n = acid base valence=amount of H⁺/OH⁻(Ca(OH)₂=2, HCl=1)
a.
Input the value(1=Ca(OH)₂, 2= HCl) :
M₂=N₂=0.1059 M
M₁. 50 ml . 2 = 0.1059 . 19.5 . 1
M₁ = 0.021
Amount of Ca(OH)₂ :
mol Ca(OH)₂ = 0.021 x 50 ml = 1.05 mlmol = 1.05 x 10⁻³ mol
b. mass of Ca(OH)₂
= mol x MW
= 1.05 x 10⁻³ mol x 74 g/mol
= 0.0777 g
%w/v = (g solute / volume of solution) x 100
%w/v =( 0.0777 g/ 50 ml) x 100 =0.155% w/v
Answer: Only I and V are true statements concerning chemical equations
Explanation: II subscripts cannot be fractions and coefficients represent the number of moles of reactants and/or products. Subscripts cannot be changed but coefficients can.
Answer:Noble gases:
are highly reactive.
react only with other gases.
do not appear in the periodic table.
are not very reactive with other elements.
Explanation:
Noble gases:
are highly reactive.
react only with other gases.
do not appear in the periodic table.
are not very reactive with other elements.