Question

. Calculate the mass of the following:
a. 2 moles of O2 molecules.
b. 2 moles of oxygen atoms.

Answer 1

Answer:

a) 2 moles of O2 =

   $mole = \frac{mass}{molar mass}$

 mass = mole x molar mass

          = 2 mol x (16 x 2)

           = 2mol x 32g/mol

           = 64 g

           = 0.064 kg

b) 2 moles of oxygen atoms

    $mole = \frac{mass}{molar mass}$

    mass = mole x molar mass

           = 2mol x 16 g/mol

           = 32 g

           = 0.032 kg

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