College Physics- buoyancy problem

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg, the radius of a balloon is 12.5 cm, the helium is at STP and it is immersed in air at 0°C and 1 atm.

I used the equation for buoyant force to find the buoyant force of one balloon. The equation is Buoyant force= (density of air)*(acceleration due to gravity)*(Volume displaced)

The weight of the person is 686/buoyant force of one one balloon= # of balloons.

I got 6710 balloons, but this is incorrect.

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  1. But you left out the weight of the Helium

    At stp a mole of Helium is 22.4 liters
    and a mole of He is 4 grams / mol

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    posted by Damon
  2. I included the weight of helium, (which is minuscule) and it still did not work.

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  3. Just as an update, I did include the weight of the helium, but I did it incorrectly. Thanks for making me check it again. Really, I am truly grateful. THANKS DAMON.

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  4. You are welcome :)

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    posted by Damon

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