What is the electronegativity value for an element whose atoms in the ground state have an electron configuration of 2-8-8-1 ?
1 answer:
The electronegative value of Potassium is 0.8 Pauling units
<h3 /><h3>What is Electronegativity:</h3>This is the tendency or strength which an atom attracts or pulls a shared electron in a covalent bond.
The electronegative value of an element is basically the strength or affinity towards electrons of other atoms and it follows a trend in the periodic table which <u>is it increases across the period and decreases down the group</u>.
In the given question, we have an element with electron configuration 2, 8, 8, 1. Sum this up and we would get the atomic number of the element.
The element with an atomic number of 19 is <u>potassium</u> which belongs to group (i) and they're primarily consisted of metals with high electro-positivity which tends to make their electron affinity lower and they generally have smaller or lower electronegative value.
Using the periodic table, we would easily see that the electronegative value of Potassium is 0.8 Pauling units.
Learn more on electronegativity here:
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Answer : The correct answer for molarity = 0.19 and Molality = 0.18
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Given : Mass of aniline = 6.2 g
Volume of solvent = 350 mL Density of solvent = 1.04 g/mL
1) Molarity : It is defined as number of moles of solute present in Litre of solution . It is expressed as :
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Molairty can be found in following steps :
Step 1 : To calculate mole :
Mole of solute can be calculate using mole formula :
Molar mass of aniline (C₆H₅NH₂) = 93.13
Mass of aniline = 6.2 g
Plugging values in mole formula :
Mole = 0.0665 mol
Step 2 : To find volume of solution
Volume of solution = volume of solute + volume of solution
Since addition of aniline does not change final volume , so volume of solvent = volume of solution. Since volume is given in mL , so it need to be converted to L .
1 L = 1000mL
Volume of solution = 0.350 L
Step 3: Plug value of mole and volume in molarity formula :
Molarity = 0.19 M or 0.19
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2) Molality : It is defined as mole of solute present in Kilogram of solvent . It can be expressed as :
Following are the steps to calculate molality :
Step 1: To find mole of Solute :
Mole of solute can be found out using mole formula . It is same as done for molarity .
Mole = 0.0665 mol
Step 2 : To find kilogram of solvent :
Mass of solvent can be calculated using density formula as :
Plugging value in density formula :
Multiplying both side by 350 mL
Mass of solvent = 364 g
Since mass is in g, it need to be converted to Kg . ( 1 Kg = 1000 g )
Mass of solvent = 0.364 Kg
Step 3: Plug values of mole and Kg in molality formula :
Molality = 0.18 m or 0.18