Question

Which contains more moles, 5 g of Carbon dioxide (CO2) or 5 g of oxygen (O2)?

(Atomic masses: C = 12 u, H = 1 u, O = 16 u)​

Answer 1

Answer:

molar mass of CO₂= (molar mass of Carbon)+

2(molar mass of Oxygen)

=> molar mass of CO₂= 12+ 2×16= 44g.

and, molar mass of O₂= 2×16= 32g.

In 44g of CO₂ ======> 1 mol of CO₂

and, 1g of CO₂ ======> 1/44 mole

so, 5g of CO₂ =====> 1/44×5 mol = 0.11 mol

and in 32g of O₂ =====> 1 mol of O₂

1g of O₂ =====> 1/32 mol

so, 5g of O₂ ======> 1/32 ×5 mol = 0.15 mol

therefore mole of 5g of O₂ is greater than 5g of CO₂.

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