Question

Number of moles of oxygen atom in 8.8g of CO2

Answer 1

Answer:

Number of moles of oxygen atom in 8.8g of CO₂ is 0.4.

Explanation:

Mole:

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.

Result:

Molar mass of CO₂ =44 g/mol

No. of moles of CO₂  present in 8.8g =  8.8/44 =0.2 moles

0.2 moles of CO₂ 2  contain = 0.2×(6.023×10²³ )=1.2×10²³  molecules

One CO₂ 2  molecule contains 2 atoms of O

∴ No. of moles of oxygen atoms in CO₂ = 2×(1.2×10²³) / 6.023×10²³ = 0.4

∴ No. of moles of O atoms in CO₂ =0.4 moles

Answer 2

Concept:

Here the concept of mole is used. The mole is the amount of substance which contains elementary entities in the atoms of 0.012 kilogram of carbon 12.

Given:

We have 8.8g of $CO_{2}$.

Find:

We have to find the number of moles of oxygen in this question.

Solution:

Molecular mass of CO₂ =44 g/mol

No. of moles of CO₂ in 8.8g =  8.8/44 =0.2 moles

0.2 moles of CO₂ contain = 0.2×(6.023×10²³ )=1.2×10²³  molecules

One molecule of CO₂ contains 2 atoms of Oxygen.

Therefore, No. of moles of oxygen atoms in CO₂ = 2×(1.2×10²³) / 6.023×10²³ = 0.4

Hence, No. of moles of oxygen atoms in CO₂ is 0.4 moles.

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