1.) The average velocity of Cl(2) molecules is 2.50 x 10^3 m/sec at a temp of 25 C therefore the average velocity of helium atoms is ??

[ i got the answer 5.94 x 10^2 m/Sec is that right]

2.) A gas is allowed to expand from 1.5 : to 12.5 L against a constant pressure of 6.5 atm. How much heat is absorbed if the cahnge in internal energy is 3672 J. ( 1 L atm/ K mole = 101.3 J/K mole)

[i got the answer 10.92 kJ] is that right ??

3.) The ionization energy of the hydrogen atom is A) 3.98 x 10^-19 B) 1.88 x 10^-19 C) 2.18 x 10^-18 D) 2.34 x 10^-15 E) 3.98 x 10^-16 F) 1.33 x 10^-27 G) 7.33 x 10^-13 H) 1.88 x 10^-16

yea i don't kno the answer or how to figure it out

22) The ionization energy ( the energy required to just remove and electron from an atom) for the hydrogen atom in kJ/mole can be calculated using thje Rydberg eqution which allows you to calculate the energy states of the electron in one atom. Use this equation to estimate the ionization energy for lithium in kJ/mole.

25) Circle all the basic oxides
K(2)O
NO(2)
CO(2)
Cs(2)O
SO(2)
Na(2)O
BaO

1.) To find the average velocity of helium atoms, we can use the root mean square velocity equation:

v(rms) = sqrt(3kT/m)

Where:
v(rms) = root mean square velocity
k = Boltzmann constant (1.38 x 10^-23 J/K)
T = Temperature in Kelvin
m = mass of the molecule/atom

Given that the average velocity of Cl(2) molecules is 2.50 x 10^3 m/s at a temperature of 25°C (which is 298 K), we can set up the ratio and solve for the average velocity of helium atoms:

(2.50 x 10^3 m/s) / sqrt(3k * 298 / m(Cl2)) = v(rms)(He)

Since the masses of Cl2 and He are known, substitute them into the equation and solve for v(rms)(He).

2.) To calculate the heat absorbed during the expansion of a gas, we can use the formula:

ΔU = q - w

Where:
ΔU = change in internal energy
q = heat absorbed
w = work done by the system

Given that the change in internal energy is 3672 J, and the gas expands from 1.5 L to 12.5 L against a constant pressure of 6.5 atm, we need to calculate the work done by the system using the equation:

w = -PΔV

Where:
P = pressure
ΔV = change in volume

Substitute the given values and calculate the work done. Then, substitute the values of ΔU and work done into the equation ΔU = q - w, and solve for q to find the heat absorbed.

3.) The ionization energy of the hydrogen atom can be calculated using the Rydberg equation:

E = -R(H)*(1/n^2)

Where:
E = ionization energy
R(H) = Rydberg constant for hydrogen (2.18 x 10^-18 J)
n = principal quantum number (1 for ionization)

Substitute the given values into the equation and calculate the ionization energy.

22) To estimate the ionization energy for lithium in kJ/mol, we can use the Rydberg equation mentioned earlier:

E = -R(Li)*(1/n^2)

Where:
E = ionization energy for lithium
R(Li) = Rydberg constant for lithium (Note: The Rydberg constant is different for each element)
n = principal quantum number (1 for ionization)

Substitute the values for lithium into the equation and calculate the ionization energy.

25) To determine the basic oxides, we need to understand that basic oxides are oxides that react with water to form bases. They are usually metal oxides. From the given compounds, we need to identify the ones that are metal oxides. Circle the oxides that have metal cations (K+, Cs+, Na+, Ba2+) to identify the basic oxides. So in this case, circle K(2)O, Cs(2)O, Na(2)O, and BaO.