How many liters of carbon monoxide at STP are needed to react with 4.80 g of
oxygen gas to produce carbon dioxide?
2CO(g) + O2(g) → 2C02(g)

6.72 L of Carbon Monoxide (CO) is needed.

Explanation:

First from the mass of the oxygen in grams is converted into moles and then it is proportionate to the moles of CO and then it is converted into its Volume in litres ( L).

4.8 g of O₂ × 1 mol of O₂× 2 mol CO ×22.4 L CO / (32 g of O₂ × 1 mol of O₂ × 1 mol of CO) = 6.72 L CO

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the answer for sodium is 0.186

the answer for rubidium is 0.251