... 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

.../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

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) J3 Answers · Science & Mathematics · 31/12/2007

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

...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

... 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

Start by converting to international units.

1 Answers · Science & Mathematics · 20/10/2012

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

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

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