Answer:
C or D
Explanation:
Hope it helped a little bit
Answer: The volume of the gold is 
The mass of gold is 19.3 g
The density of gold is 
Explanation:
Density is defined as the mass contained per unit volume.

Given : Mass of gold = 19.3 grams
To calculate the volume of cube, we use the equation:

where,
V = volume of cube
a = edge of cube
Volume of gold = 
Putting values in above equation, we get:
Putting in the values we get:

Thus density of gold will be 
Answer:
The equilibrium law
Explanation:
According to the equilibrium law , when
of any of the reactants or the products in the reaction at an equilibrium state, is changed, then it changes the composition of equilibrium mixture in order to minimize the effect of
Acetic acid (in excess) +
⇄
+ water
is a reaction which involves the equilibrium. So to force the reaction towards the side of
, one of the reactant is taken in excess. All this can be explained easily by applying the equilibrium law.