When an equation is used to calculate the amount of product that will form during a reaction, the value obtained is called the

Theoretical yield.

Explanation:

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In stoichiometry, chemical quantities are computed in order to quantify a chemical reaction, in such a way, a yielded amount could be understood as the obtained either mass or moles of a particular product. Such obtained amount could be real which is gotten at a laboratory or theoretical which is gotten via a stoichiometric formula or equation, in such a way, when an equation is used to calculate the amount of product that will form during a reaction, the value obtained is called the theoretical yield which is the yield we expect to obtain once the chemical reaction goes to completion.

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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