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  1. ... the formula mass=(Number of moles of helium *Molar mass of helium ) In this case it would be (1.67* 10 ^-18)*(4) The answer to that will be (6.67* 10 ^-18) Thats your...

    2 Answers · Science & Mathematics · 05/04/2011

  2. .../V n = moles = 4 atoms x (/ 1 mole / 6.022 x 10 ^23 atoms) r = .0821 L atm/moleK) T = (20 + 273.15...

    1 Answers · Science & Mathematics · 12/12/2007

  3. E=mc2 and m = 4.68 x 10 -28 kg => E = (4.68 x 10 -28) * (3 x 10 ^8)^2 = 4.22 x 10 ^(-11) J

    3 Answers · Science & Mathematics · 31/12/2007

  4. rate of helium diffusion = 10 .0 ml / 5.47 min = 1.8281535 ml / minute the unknown diffuses at 10 .0 / 25...

    2 Answers · Science & Mathematics · 26/10/2013

  5. ...in K). p = 120 * 6894.75729 / 1000 p = 827.3708748 kPa V = pi*( 10 /2)^2 * 30 / 1000 V = 2.3562 L T = 20 + 273.15 T = 293...

    2 Answers · Science & Mathematics · 17/01/2010

  6. ... in stars happened in the Universe to create helium ( 10 % of all atoms were helium ) and some lithium. The universe ...

    3 Answers · Science & Mathematics · 11/05/2010

  7. The Sun has a mass of 1.9891 × 10 ^ 30 kg Of that 24.85% is Helium . From that convert kg to metric tonnes 1,000 kg = 1 metric tonne...

    2 Answers · Science & Mathematics · 03/08/2012

  8. Hmm... is it 4 moles of Helium gas and not 4 atoms? If so, then us PV=nRT...

    1 Answers · Science & Mathematics · 05/05/2012

  9. Let's have the alpha particle initially headed to the right (so its momentum is positive). The positions are closest when both particles have the same velocity (which is not zero!): (4M - M)*3e6m/s = 5M*v where...

    1 Answers · Science & Mathematics · 05/11/2020

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