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1. ### What wavelength (in nm) is observed when an electron in a helium atom transitions from n=3 to n=2?

Atomic number of helium , Z = 2 Rydberg constant, R = 1.097 × 10⁷ m⁻¹...

1 Answers · Science & Mathematics · 22/09/2020

2. ### how come helium stays liquid at 0 deg kelvin, but hydrogen is solid?

Who says anything about what happens at 0 K?  0 K cannot be achieved. But I would guess the answer to the question to be: because hydrogen has hydrogen bonds and helium does not.

1 Answers · Science & Mathematics · 19/06/2020

3. ### 1. Helium in a 100 mL container at a pressure of 66.6 kPa is transferred to a container with a volume of 250 mL. What is the ...?

Given: Pi = 66.6 kPa Vi = 100 mL Vf = 250mL Ti = 20 oC = (20.0+273) K = 293 K Tf = 15.0 oC = (15.0+273) K = 288 K use: (Pi*Vi)/(Ti) = (Pf*Vf)/(Tf) (66...

1 Answers · Science & Mathematics · 22/05/2020

4. ### A helium -filled weather balloon has a volume of 767 L at 17.9°C and 752 mmHg. ?

(767 L) x (–29.1 + 273) K / (17.9 + 273) K x (752 mmHg / 337 mmHg) = 1435 L

1 Answers · Science & Mathematics · 24/04/2020

5. ### What is the final pressure of helium and neon gas mixture in this case?

((10.0 mol x 5.00 bar) + (5.00 mol x 20.0 bar)) / (10.0 mol + 5.00 mol) = 10.0 bar

2 Answers · Science & Mathematics · 04/10/2020

6. ### What is the pressure in millimeters of mercury of 0.0135 mol of helium gas with a volume of 224 mL at 50. ∘C? ?

P = nRT / V = (0.0135 mol) x (62.36367 L mmHg/K mol) x (50. + 273) K / (0.224 L) = 1214 mmHg

2 Answers · Science & Mathematics · 11/03/2020

7. ### You have helium gas in the right side of a two-bulbed container connected by a valve. Initially the valve is closed.?

(4.40 atm) x (3.23 L) / (3.23 L + 9.43 L) = 1.12 atm

3 Answers · Science & Mathematics · 17/09/2020

8. ### Which of the following elements are stable as atoms? Se He F Ar?

Helium and Argon. They are both noble gases and their outer electron valence she's are completely filled with electrons.

5 Answers · Science & Mathematics · 28/01/2020

9. ### simple chemistry question?

Rate(He)/Rate(Cl₂) = √[MM(Cl₂)/MM(He)] = √(35.5×2/4.00) = 4.21 The answer: 4.21 (The third option)

1 Answers · Science & Mathematics · 01/06/2020

10. ### Determine the difference in the binding energy of 3/ 1H and 3/2He.?

... trying to refer to an isotope of hydrogen with mass = 3 .. and an isotope of helium with mass 3  ..  it is a simple math problem    tritium has 2 ...

1 Answers · Science & Mathematics · 20/05/2020

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