When hydrogen is burned as a fuel, the primary waste product produced is

Explanation:

A combustion reaction is defined as the one which when reacts with oxygen atom results in the formation of carbon dioxide and water.

As most of the fuels are hydrocarbons hence, they also produce carbon dioxide and water upon combustion.

And, when hydrogen is burned as a fuel then the reaction is as follows.

Thus, we can conclude that when hydrogen is burned as a fuel, the primary waste product produced is .

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