The wavelength in a longitudinal wave refers to the distance between two consecutive compressions or between two consecutive rarefactions. Amplitude. The amplitude is the maximum displacement from equilibrium.
Use formula: Initial Pressure x Initial Volume/Initial temperature = Final pressure x Final Volume/Final Temperature => 17.15L
Answer : The molality of NaCl is, 1.95 mol/kg
Explanation :
Formula used for Elevation in boiling point :

where,
= change in boiling point = 
= boiling point constant for water = 
m = molality
i = Van't Hoff factor = 2 (for electrolyte)
The dissociation
will be,

So, Van't Hoff factor = Number of solute particles =
= 1 + 1 = 2
Now put all the given values in the above formula, we get:


Therefore, the molality of NaCl is, 1.95 mol/kg
Dipole-induced dipole forces.
In contrast to C2H5OH, which is a very polar molecule, bromine is non-polar and has zero dipole moment. Charges are separated within polar molecules.
When a nonpolar Br2 molecule interacts with a polar C2H5OH molecule, one half of the bromine molecule acquires a charge and the other half acquires an opposing charge. A dipole is created when two adjacent bromine molecules have different charges. Bromine molecules must thus overcome the intermolecular forces—also known as dipole-induced dipole forces—that form in order to dissolve in ethanol.
Find more on bromine at : brainly.com/question/865727
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Answer : The balanced chemical reaction will be:

Explanation :
As per question when copper(II) oxide react with sulfuric acid then it gives copper(II) sulfate and water.
This reaction is known as double displacement reaction in which cation of two reactants exchange their places to give two different products.
The balanced chemical reaction will be:
