# Yahoo Web Search

related to hydrogen

1. Sort by

1. ### Stars are made up of hydrogen so where does neutrons come from?

The fusion reaction between four H atoms makes a neutron. see below.

4 Answers · Science & Mathematics · 07/05/2019

2. ### A hydrocarbon is a compound that contains mostly carbon and hydrogen. .?

carbon atomic mass 12.011 g/mol H 1.008 g/mol C10 = 120.11 g H22 = 22.176 g total = 142.286 g %C = 120.11/142.286 = 0.844 or 84.4% %H is the rest, 15.6%

2 Answers · Science & Mathematics · 26/02/2019

3. ### The elements contained in acetylsalicylic acid, the active ingredient in aspirin, are carbon, hydrogen, and oxygen. The combustion of 4.000g?

n = PV / RT = (0.987 atm) x (3.87 L) / ((0.082057338 L atm/K mol) x (25 + 273) K) = 0.1562 mol CO2 (0.1562 mol CO2) (1 mol C / 1 mol CO2) × (12.01078 g C/mol) = 1.876 g C (1.300 g H2O) / (18.01532 g H2O/mol) × (2 mol...

1 Answers · Science & Mathematics · 04/09/2019

4. ### Suppose a sample of hydrogen gas (H2) was collected over water. If the total pressure of the system was 755 mm Hg at 25.5oC,?

1. Original: P₁ = (755 - 22.1) mmHg = 732.9 mmHg, V₁ = 38.00 mL, T₁ = (273.2 + 25.5) K = 298.7 K STP: P₂ = 760 mmHg, V₂ = ? mL, T₂ = 273.2 K Combined gas law...

1 Answers · Science & Mathematics · 03/04/2019

5. ### The Andromeda galaxy is moving toward us at 3.01x105 m/s. By how much will the frequency of the 6.17x1014 Hz hydrogen?

For a stationary receiver (observer), new frequency f = F₀*c/(c + v) ← v -ve if src moving toward rcvr using c = 299 792 458 m/s, new f = 6.17e14Hz * 299792458m/s / (299792458m/s - 3.01e5m/s) new f = 617620107836264.23161624863437674 Hz and so the shift is Δf = f - F₀...

1 Answers · Science & Mathematics · 26/08/2019

6. ### A sample of ammonia gas is completely decomposed to nitrogen and hydrogen gases. If the total pressure is 866 mmHg, calculate the partial pr?

Looking at the balanced equation, nitrogen composes 1/4 of the total moles of products. (1/4) x (866 mmHg) = 216.5 mmHg N2

1 Answers · Science & Mathematics · 15/02/2019

7. ### By rinsing your mouth with hydrogen peroxide on a severely bleeding abscess tooth will it make it worse?

It will kill the surface bacteria on any open wound area, and basically seal the wound also. That doesn't mean it will improve the abscess, just act as a stopgap from it getting worse. If it's bleeding, it's very serious. You need to call a...

2 Answers · Health · 12/01/2019

8. ### Its another TRUE. You love hydrogen and oxygen, and that for you proves not all chemicals are bad. ;-)?

True Stan, and NaCl isn't bad either. I love those chemicals.

5 Answers · Entertainment & Music · 23/12/2018

9. ### “Why do hydrogen and oxygen individually combust a fire but when put together put the fire out”?

When H2 burns, it needs O2 H2 + 1/2 O2 -----> H2O This is an exothermic reaction (heat is released). Therfore oxygen is required for combustion. Specific heat capacity of...

4 Answers · Science & Mathematics · 23/01/2019

10. ### A sample of a compound that only contains hydrogen and sulfur has 4.0 g of hydrogen and 64.0 g of Sulfur.?

Moles of H in the compound = 4.0 /1 = 4 moles moles of S = 64.0 / 32 = 2 moles molar ratio = 4:2 or 2:1 if we have 20.6 g of H we have 20.6 moles using the above empirical formula we have 10.3 moles of S mass of S in the compound = 10.3 * 32...

1 Answers · Science & Mathematics · 29/06/2019