Write condensed and bond-line structural formulas for all of the constitutional isomers Practice problem 4.1 with the molecular formula C7H16. (There are a total of nine constitutional isomers.)

See figure 1.

Explanation:

In this case have to take into account that all structures must have the formula: . If we remember the general formula for alkanes: if we have "7" carbons (n=7) we will have 16 hydrogens.  Therefore all the structures that fit with this formula are alkanes.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3