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1 mole of a pure substance has a mass equal to its molecular mass (MM)

so 1 mole of a substance x MM

with oxygen its molar mass is 15.9994

so if your trying to find HALF

then the equation would be 0.5 x 15.9994

therefore half a mole of oxygen gas will weigh exactly

7.9997 grams approx 8grams

Google usually helps with these sorts of equations aswell

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