6. a gas mixture has partial pressure of 120 torr n2, 350 torr ar, and 480 torr sf6. what is the mole fraction of sulfur hexafluoride in the mixture?

The mole fraction of SF6 = 0.505

Explanation:

Step 1: Data given

A gas mixture has partial pressure of:

120 torr N2

350 torr Ar

 480 torr SF6

Step 2: Calculate the total pressure

Total pressure = P(N2) + P(Ar) + P(SF6)

Total pressure = 120 + 350 + 480 = 950 torr

Step 3: Calculate the mole fraction

Mole fraction = Partial pressure / total pressure

Mole fraction SF6 = 480 torr / 950 torr

Mole fraction SF6 = 0.505

The mole fraction of SF6 = 0.505

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.