[25 pts] when a 14.2g sample of a compound containing only mercury and oxygen is decomposed, 13.2g of hg is obtained. what is the percent composition of this compound?

% hg=
% o=
explain (in words) how you got your answers:

% composition of Hg = 93 %

% composition of O = 7 %

Explanation:

Data Given:

mass of total sample = 14.2 g

mass of mercury (Hg) = 13.2 g

percent composition of Hg =

percent composition of O =

Solution:

First find mass of oxygen

As this compound only have two components that is oxygen and mercury

So

upon decomposition it gives 13.2 g mercury

now to find mass of oxygen we have to subtract mass of mercury from total mass of sample

                 Mass of oxygen =  Total mass of sample - mass of Mercury

                 Mass of oxygen =  14.2 g - 13.2 g

                 Mass of oxygen =  1 g

Now to find percent composition of Hg and Oxygen

% composition = component mass / total mass of sample x 100. . . .(1)

For % composition of mercury Hg

Put values in equation 1

             % composition of Hg = 13.2 g / 14.2 g x 100

               % composition of Hg = 93%

For % composition Oxygen (O)

Put values in equation 1

             % composition of O = 1 g / 14.2 g x 100

               % composition of O = 7 %

gold is my favorite solid.

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