# Yahoo Web Search

1. ### hey can you find the mass of 1.0 x 10 ^6 atoms of He ( helium ) ?

... 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. ### 4 atoms of helium gas are placed in a container at 20degreesC, the pressure is found to be 10 units.?

.../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 If the loss of mass in creation of one helium nucleus is 4.68 x 10 -28 kg, how much energy will be create

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. ### It takes 25.5 minutes for a 10 .0-mL sample of an unknown gas to effuse through a pinhole. A 10 .0-mL sample of?

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. ### A 10 -cm-diameter cylinder of helium gas is 30 cm long and at 20 degree C. The pressure gauge reads 120 psi.?

...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. ### Why were hydrogen and helium the first elements in the universe?

... 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 fastest recorded skydive was by an Air Force officer who jumpedfrom a helium balloon at an elevation of 10 ?

Start by converting to international units.

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

8. ### how many tonnes of helium does the sun have in it?

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

9. ### Total pressure of helium atoms.?

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

10. ### 2 particles, a proton with charge 1.6 x 10 ^-19 C and mass 1.67 x 10 ^-27 kg and an alpha particle( helium -4 nucleus) with charge 3.2x10^-19 C ?

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