Volume in liters:
139 cm³ / 1000 = 0.139 L
molar mass Argon = 39.95 g/mol
1 mole -------- 22.4 L ( at STP )
? mole ------- 0.139 L
moles of argon :
0.139 * 1 / 22.4 = 0.00620 moles
Mass of argon :
0.00620 * 39.95 = 0.24769 g
hope this helps!
Density of gold = 19.3 g/mL
Density can be calculated from volume and mass of a substance as follows,

Given the volume of gold nugget = 5.40 mL
Calculating the mass of gold nugget from density and volume:



Therefore, the mass of the nugget is 104.22 g
Phosphorus, Chlorine. The IUPAC name is Phosphorus pentachloride