Question

Number of moles in 64 g of Oxygen are:
(A) 1.5
(B) 2.0
(C) 2.5
(D) 3.0​

Answer 1

Answer:

3.0 moles

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Answer 2

Given:

64 grams of oxygen.

To find:

The number of moles.

Solution:

To determine the number of moles we have to follow the below steps-

The atomic weight of oxygen is 16 grams.

Hence the molecular weight of oxygen gas is 16×2=32 grams.

We know that-

32 grams of oxygen occupy 1 mole.

Hence 64 grams of oxygen occupy 64/32=2 moles.

Hence the number of moles in 64 grams of oxygen is 2 moles.

Hence the correct option is B.