2.5 moles O2
Determine the mass (grams)

80g

Explanation:

Given parameters:

Number of moles of O₂  = 2.5moles

Unknown:

Mass of O₂  = ?

Solution:

To solve this problem, we use the expression below

      Mass  = number of moles x molar mass

Molar mass of O₂  = 2(16) = 32g/mol

  So;

   Mass  = 2.5 x  32 = 80g

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.