Question

How many moles are in 60 grams of oxygen (O2)?
A. 1.875 moles
B. 3.20 moles
C.1360 moles
D. 0.369 moles

Answer 1

Answer:

The answer would be 1.875.(A)

Explanation:

the number of moles in a given mass of a substance is (mass of the given substance)/molar mass).

Now the molar mass of oxygen is simply 32g.

We know this by the very definition of mole concept.

If you are still confused I would recommend Khan Academy.They are great at teaching chemistry.

now if we apply the earlier formula,

it will be 60g/32g which is equal to 15/8 = 1.875.

Answer 2

Answer:

Option A is the correct out of all

Explanation:

Molar mass of oxygen gas(O2)=2× 16

= 32g.

Formula for calculating no.of moles=

No.of moles=Given mass/Molar mass

n=m/M

Given mass=60 grams

Molar mass of O2=32grams

Put values in formula

n=60/32=1.875

So,your ans.is 1.875 moles

Therefore,1st option is correct

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