Ageochemist has determined by measurements that there are 33.7 moles of tin in a sample of cassiterite. how many moles of oxygen are in the sample?

             67.4 mol of O atoms

Explanation:

Cassitrerite is a Tin Mineral having a chemical formula SnO₂. As seen in chemical formula there are two moles of Oxygen atoms for each Tin atom. So we can conclude that,

For,

               1 mole of Sn in SnO₂ there are  =  2 moles of O atoms

So for,

               33.7 moles of Sn there will be  =  X moles of O atoms

Solving for X,

                     X  =  (33.7 mol of Sn × 2 mol of O) ÷ 1 mol of Sn

                     X  =  67.4 mol of O atoms

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.