A solution was made by mixing benzene () and carbon tetrachloride (). Given that the mole fraction of carbon tetrachloride is 0.824 in the solution obtained from 60.5 g , calculate the mass of benzene used. Mass

Explanation:

Hello,

In this case, considering the mole fraction of carbon tetrachloride, we can write:

Whereas the moles of carbon tetrachloride are computed from the given 60.5 g (molar mass 153.82 g/mol):

So we can compute the moles of benzene from the definition of molar fraction:

Now, with the molar mass of benzene (78.11 g/mol) we compute the mass of benzene:

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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.