The ideal gas constant, r has several different values that could be used. which quantity causes these differences?
pressure
temperature
volume
moles

Pressure

Explanation:

The pressure is sometimes measured in different units

pressure

Explanation:

The different values of R are as follows:

R = 0.0821 liter•atm/mol•K.

R = 62.3637 L•Torr/mol•K or L•mmHg/mol•K.  

Here the different units of pressure are atm, Torr and mmHg.  

The unit of volume, temperature and moles are Liter (L), Kelvin (K) and mol respectively.

When different values of Pressure are used and expressed in different units that cause a change in the value of R.

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