Consider three generic acids: HX , HY , and HZ . The number of H plus and X minus ions in solution is equal to the initial number of HX molecules added to the solution. One quarter of the HZ molecules form H plus and Z minus ions in solution. The other three quarters of the molecules remain as HZ in solution. One half of the HY molecules form H plus and Y minus ions in solution. The other half of the molecules remain as HY in solution. Arrange the acids according to strength.

Decreasing order of strength of the the acids :

Explanation:

The strength of an acid is measured by their pH of aqueous solution.

Solution of HX , has equal number of hydrogen ions as a that of its initial molecules o HX.

Solution of HY , molecules of hydrogen ions are half of the molecules of HY.

Solution of HZ , one quarter molecules of hydrogen ions and three quarter  of the molecules of HY.

This means that HX is strongest acid followed by HY and then HZ.

Decreasing order of strength of the the acids :

the role of the microscope world in creating new materials .

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