If a molecule has an empirical formula of c2h2o and a molecular mass of 84.0 g/mol, what is the molecular formula?

=C₄H₄O₂

Explanation:

Given the empirical formula of a molecule, the he the quotient of the molecular mas and and the empirical mass=constant.

84.0 g/mol/mass of(C₂H₂O)=constant

=84/(12×2+1×2×16)

=84/42

=2

Therefore, the molecular formula is (C₂H₂O)₂=C₄H₄O₂

is the molecular formula

Explanation:

Empirical formula is the simplest form of a Molecular formula.

For example  

Molecular formula of glucose is

Its empirical formula is

The subscript numbers of the molecular formula is divided by a common number n=6 here.

Another example:

Molecular formula of Octane is and Its empirical formula will be  

Subscripts divided by n=2.

To find n we make use of the formula  

So, we see n=2 here

Empirical formula × n = molecular formula

is the molecular formula

(Answer)

Please note:

Molar mass is the mass of 1 mole of the substance and its unit is g/mol .

n is the number of moles by which the empirical formula is multiplied to get the molecular formula of the compound.

2b2t

explanation:

2b2t

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.