Answer:
The ratio of atoms of potassium to atoms of oxygen is 2:1
Explanation:
As the equation given is :
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The product formed is 2 moles of potassium oxide .
Amount of potassium atom in the potassium oxide is 2 atoms of potassium and amount of oxygen atom present here is 1 atom of oxygen .
But we have 2 moles of potassium oxide . So, the potassium and oxygen atoms will be multiplied by 2 .
Hence , we get 4 atoms of potassium and 2 atoms of oxygen .
Ratio of potassium to oxygen atoms is - 4:2
Therefore , 2:1
Answer: B. strontium
Explanation: This is due to electrons being further away from the nucleus in strontium.
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Answer : The mass of 12.3 moles of helium (He) is, 49.2 grams.
Solution : Given,
Moles of helium = 12.3 moles
Molar mass of helium = 4 g/mole
Formula used :
Therefore, the mass of 12.3 moles of helium (He) is, 49.2 grams.