Question

If a sample of CO2 contains 48 grams of oxygen, how many moles of CO2 are there?

Answer 1

Answer:

C +O2 =CO2

12g +32g =44g

Frm the equation 32g O2 produces 1 mole CO2.

Hence 16g O2 produces 16 /32 =1/2 mole Co2.

1/2 mole CO2 contains 16 gm of oxygen.

This is the answer.

Explanation:

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Answer 2

Given info : a sample of CO₂ contains 48 grams of oxygen.

To find : the number of moles of CO₂ are ...

solution : we know, molecular weight of CO₂ = 44g/mol

atomic weight of Oxygen = 16 g/mol

no of moles of oxygen atoms = given mass of oxygen/atomic mass

= 48/16 = 3 moles

∵ one mole of carbon dioxide contains 2 moles of oxygen atoms.

1.5 moles of carbon dioxide contains 3 moles of oxygen atoms.

therefore the number of moles of carbon dioxide in the sample is 1.5 moles.