What is the amount of oxygen substance weighing 6.4 g

The solution to this problem:
Recall that the amount of a substance is measured in moles (n)
m is the mass of the substance, and
M is the molar mass of the substance.
n = m / M
it follows that
n = 6.4g / 32g / mol
n = 0.2 mol
Answer: 0.2 mol.



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