Question

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

Answer 1

Answer:

1.5 Moles of CO₂

Explanation:

C + O₂ ---------> CO₂

12g +32g = 44g

From the equation, 32g O₂ produces 1 mole of CO₂.

Hence 48g O₂, produces  $\frac{48}{32}$ = 1.5 mole of CO₂.

Therefore, the answers is 1.5 moles of CO₂.

Answer 2

Concept:

The number of moles can be calculated by taking the ratio of the mass of the compound to the molar mass of the compound.

n = m/M

where n is the number of moles, M is the molar mass of the compound and m is the mass given.

Given:

Mass of the oxygen in the compound = 48 g

Find:

The number of moles of the CO₂ present.

Solution:

The compound CO₂ contains two moles of oxygen.

The atomic mass of the oxygen is 16 grams.

One mole contains 32 grams of oxygen.

The number of moles of CO₂ is equal to the number of O₂ present, So, finding the number of O₂ present,

Number of O₂ = 48/32 = 3/2

Number of O₂ = 1.5

Hence, a total of 1.5 moles of CO₂ are present in the sample which contains 48 grams of oxygen.

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