B)

How many g of O2 are needed to produce 6.0 mol of H2O?

Mass of oxygen that will be required to produce 6 mole of water is 96g.

Explanation:

Mass of oxygen = ?

Atomic mass of oxygen is = 16g

Molecular mass of O₂ = 32 g

Now, according to question statement we need to calculate oxygen needed to produce 6 mol of water.

In 1 mol of water, there is O₂/2 is present or we can say that 1 oxygen atom is present.

We also know that,

1 mol of water has = 1 mole of oxygen

Therefore,

6 moles of water will have 6 moles of oxygen atom

Mass of 6 moles of oxygen atom can be calculated as:

Mole = given mass/atomic mass

6=X / 16

X = 16 x 6

=96g