what is the mass of o.2 mole of o2
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3.2 grams
The mass of 1 mole of oxygen atoms is 16, which is the gram molecular weight. So, for one mole of atoms the weight is 16. 0.2 moles of atoms the weight will be 16*0.2 which is equal to 3.2 grams.
The mass of 1 mole of oxygen atoms is 16, which is the gram molecular weight. So, for one mole of atoms the weight is 16. 0.2 moles of atoms the weight will be 16*0.2 which is equal to 3.2 grams.
peregreen:
thanks man
Any time for help
Its 6.4 g...see my answer
If the question was for 0.2 mole oxygen atoms then your answer is correct.
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We have to just use the formula,
No. of moles × Molecular mass = Given mass
Hence, 0.2 × 32 = Mass
i.e., Mass of 0.2 moles of O2 is 6.4 g
Here, in formula we have used molecular mass of O2 (2×16=32 g/mol) because it is a diatomic gas and if it was for single O atom then instead of molecular mass we would have used "Atomic mass of O" i.e., 16 g/mol
No. of moles × Molecular mass = Given mass
Hence, 0.2 × 32 = Mass
i.e., Mass of 0.2 moles of O2 is 6.4 g
Here, in formula we have used molecular mass of O2 (2×16=32 g/mol) because it is a diatomic gas and if it was for single O atom then instead of molecular mass we would have used "Atomic mass of O" i.e., 16 g/mol
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