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1. ### What would the mass of 1 Liter (1000 mL or 1000 cm3) of hydrogen be?

a milliliter is also one cubic cm. You have 1000 of those units. Multiply the density by 1000 to get the mass.

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

2. ### how much energy is required to remove an electron from the hydrogen atom if the electron begins at n=1?

The energy of the n=1 level is -13.6 eV relative to the electron being at infinity. So the required energy (ionization energy) is 13.6 eV.

3 Answers · Science & Mathematics · 01/06/2019

3. ### At 25 °C, what is the hydroxide ion concentration, [OH−] , in an aqueous solution with a hydrogen ion concentration of [H+]=1.2×10−5 M?

[H⁺] [OH⁻] = Kw Hence, [OH⁻] = Kw / [H⁺] = (1.0 × 10⁻¹⁴) / (1.2 × 10⁻⁵) M = 8.3 × 10⁻¹⁰ M

1 Answers · Science & Mathematics · 07/08/2019

4. ### Assuming that all the H+ comes from HCl, how many grams of sodium hydrogen carbonate will totally neutralize the stomach acid?

0.004 mol X 84g/mole = 0.336 g <<< answer

1 Answers · Science & Mathematics · 01/04/2019

5. ### what is the mass of 15.9 moles of sulfuric acid h2so4?

(0.00101 kg H/mol x 2) + 0.0321 kg S/mol + (0.016 kg O/mol x 4) = 0.0981 kg/mol H2SO4 (15.9 mol) x (0.0981 kg/mol) = 1.56 kg

2 Answers · Science & Mathematics · 22/05/2019

6. ### What is the wavelength of a photon that will excite an electron from n=3 to n=5 in a hydrogen atom?

change in energy = R(1/3² - 1/5²) = 1.55e-19 J and change in energy = hv / λ so λ = hv / change in energy = 6.626e−34J·s * 2.998e8m/s / 1.55e-19J λ = 1.282e-6 m = 1.282 µm = 1282 nm

2 Answers · Science & Mathematics · 14/06/2019

7. ### Helium costs \$125 a tank & Hydrogen \$40 a tank and has more lifting power, so why don't blimps and balloons just use Hydrogen?

This is why ... see the link.

7 Answers · Science & Mathematics · 17/05/2019

8. ### 1.00molof hydrogen gas and 1.00mol of iodine are sealed in a 1000ml temp of 450, at Equilibrium 1.56mol of hydrogen iodine rpresent calc.Keq?

H2 + I2 → 2 HI 1.56 mol HI x (1 mol H2 / 2 mol HI) = 0.78 mol H2 reacted 1.00 mol originally - 0.78 mol reacted = 0.22 mol H2 (or I2) at equilibrium Keq = [HI]^2 / ([H2] [I2]) = (1.56 mol HI...

1 Answers · Science & Mathematics · 31/05/2019

9. ### The equilibrium system between hydrogen gas, bromine gas, and hydrogen bromide gas is given. H2(g)+Br2(g)↽−−⇀ 2HBr(g)?

The reverse reaction is already given, you just have to read from right to left: 2HBr(g) <=> H2(g) + Br2(g)

1 Answers · Science & Mathematics · 16/05/2019

10. ### Which intermolecular forces for these formulas?

... forces) .... there will also be Debye forces - Hydrogen Bonds - Ion-Dipole Forces .... for this you need an ion...

2 Answers · Science & Mathematics · 25/08/2019