Lithium has two isotopes, lithium-6 weighing 6.015 amu (7.5% abundance), and lithium-7 weighing 7.016 amu (92.5% abundance). What is the atomic mass of lithium?
with calculations

The answer is 6.941 but I dont really have the explanation

Explanation:

answer: h+ its less than oh

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.