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ACT Exam  >  ACT Questions  >  How many moles of oxygen are present in 64 gr... Start Learning for Free
How many moles of oxygen are present in 64 grams of oxygen?
  • a)
    three moles
  • b)
    two moles
  • c)
    one mole
  • d)
    16 moles
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
How many moles of oxygen are present in 64 grams of oxygen?a)three mol...
As we know that the number of moles of a gas is given by the amount of the substance in weight divided by the molecular weight of the substance. So in case of oxygen, it is 64 grams divided by 32 grams and that is two moles.
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How many moles of oxygen are present in 64 grams of oxygen?a)three mol...
Calculation:
To calculate the number of moles of oxygen present in 64 grams, we need to use the formula:
Number of moles = Mass of substance (in grams) / Molar mass of substance

Step 1: Find the molar mass of oxygen
The molar mass of oxygen (O2) is approximately 32 g/mol. This means that one mole of oxygen weighs 32 grams.

Step 2: Calculate the number of moles
Number of moles = 64 grams / 32 g/mol
Number of moles = 2 moles
Therefore, there are 2 moles of oxygen present in 64 grams of oxygen.
Therefore, the correct answer is option B) two moles.
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How many moles of oxygen are present in 64 grams of oxygen?a)three molesb)two molesc)one moled)16 molesCorrect answer is option 'B'. Can you explain this answer?
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