Which step would a student find the molecular formula of a compound from the empirical formula?
multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
subtract the ratio of the actual mass of the compound to the empirical formula mass from the subscripts of the empirical formula.
divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
add the ratio of the actual mass of the compound to the empirical formula mass to the subscripts of the empiric

Divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

To calculate the molecular formula, we need to find the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is:

Thus molecular formula=

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).