Answer:
1.25 mol LiF
Explanation:
5.00 M solution means
5.00 mol LiF in 1 L solution=1000mL
x mol LiF in 250 mL
x = 5.00*250/1000 = 1.25 mol LiF
Answer:
B.) 6
Explanation:
Attached below is the Lewis structure of PCl₃ . Since phosphorus (P) has 5 valence electrons and chlorine (Cl) has 7 valence electrons, there should be 26 valence electrons (5 + 7(3) = 26) in the Lewis structure.
Bonding electrons are the electrons present in the chemical bonds between two atoms.
There are 2 electrons shared in every single bond. Within PCl₃, there are 3 single bonds. As such, there are 6 bonding electrons in the Lewis structure of PCl₃.
Alfred Wagner's evidence began at the simplest form that the continents appeared to<em> fit</em> together like pieces to a puzzle. It wasn't only that though. The evidence showed that the same rocks and fossils existed on separate continents - the same continents that if pieced together would be connected.
Answer : The more abundant isotope is, Li isotope-7
Explanation :
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
For Li isotope-7 :
Mass of Li isotope-7 = 7 amu
Fractional abundance of Li isotope-7 = 92.5 %
For Li isotope-6 :
Mass of Li isotope-6 = 6 amu
Fractional abundance of Li isotope-6 = 7.5 %
Average atomic mass of Li = 6.941 amu
As we know that the more abundant isotope is that whose percentage abundant will be more and atomic mass of isotope will be near to average atomic mass of isotope.
From this we conclude that, the percentage abundant of Li isotope-7 is more and their atomic mass is near to average atomic mass.
Hence, the more abundant isotope is, Li isotope-7
