Question

Find the mass of oxygen contained in 1 kg of potassium nitrate KNO3.

a.475.5g

b.485.5g

c.475.2g

d.485.2g​

Answer 1

Answer:

option C is correct answer 475.2g

Explanation:

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Answer 2

Answer :-

Chemical Formula of the Potassium Nitrate = KNO₃.

Chemical Formula of the Potassium Nitrate = KNO₃.Molar Mass of the Potassium Nitrate = 102 g/mole.

Mass of the Potassium Nitrate = 1 kg.

= 1000 g.

Mass of the Oxygen present in one mole of Potassium Nitrate = 48 g.

∵ 102 g of the Potassium Nitrate contains 48 grams of the Oxygen.

∵ 102 g of the Potassium Nitrate contains 48 grams of the Oxygen.∴ 1 grams of the Potassium Nitrate contains 48/102 grams of the Oxygen.

∵ 102 g of the Potassium Nitrate contains 48 grams of the Oxygen.∴ 1 grams of the Potassium Nitrate contains 48/102 grams of the Oxygen.∴ 1000 grams of the Potassium Nitrate contains (48/102) × 1000 g of the Oxygen.

∵ 102 g of the Potassium Nitrate contains 48 grams of the Oxygen.∴ 1 grams of the Potassium Nitrate contains 48/102 grams of the Oxygen.∴ 1000 grams of the Potassium Nitrate contains (48/102) × 1000 g of the Oxygen. = 470.58 grams.

Hence, the Mass of the Oxygen in 1 kg (or 1000 g) of the Potassium Nitrate is 470.58 grams.

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