The insulating and packing material styrofoam is a dating and packing material styrofoam is a polymer of styrene. find the molecular formula of sy ene given its percent composition: 922 775 h the approximate molar mass of styrene is 104 g/mol. a) che bị ch c)c12h d) ch12 e) c8hg

Explanation:

In order to find the molecular formula, we have to find the empirical formula first of all.

It is known that is a styrofoam, elements present are carbon and hydrogen atoms.

Element     %         Atomic mass       Molar ratio           Simple ratio

    C        92.25          12.01               = 7.68                  = 1

     H        7.75            1.008             = 7.68                  = 1

As empirical formula of styrofoam is C_{x}H_{x}.

Hence, empirical mass = (12.01 + 1.008) g/mol = 13.018 g/mol = 13.0 g/mol (approx)

Molar mass given is 104 g/mol.

So,     = = 8

Thus, we can conclude that molecular formula of the given styrene is .

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.

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