Anew element was recently discovered and found to have an atomic weight of 342.38 amu. this element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. what is the mass of the heavier isotope?

Atomic weight of new element is 342.38 amu. The mass of lighter isotope is 340.91 amu and abundance 68.322 %.

Since, the total abundance is 100% , the abundance of heavier isotope will be (100-68.322) %=31.678%

The formula for atomic weight or average atomic weight of element is as follows:

Average atomic weight= Mass of lighter isotope×% abundance of lighter isotope+Mass of heavier isotope×% abundance of heavier isotope.

Putting the values,

Average atomic weight= 340.91×0.68322+Mass of heavier isotope×0.31678

342.38 amu=232.91+Mass of heavier isotope×0.31678

On rearranging,

Thus, mass of heavier isotope will be 345.55 amu.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

the answer is c. nacl