Which statement is true according to the kinetic theory?
a. molecules of different gases with the same mass and temperature always have the same average density
b. molecules of different gases with the same mass and temperature always have the same average volume
c. molecules of different gases with the same mass and temperature always have the same pressure.
d. molecules of different gases with the same mass and temperature always have the same molecular mass
e. molecules of different gases with the same mass and temperature always have the same average kinetic energy

Molecules of different gases with the same mass and temperature always have the same average kinetic energy - E.

Molecules of different gases with the same mass and temperature always have the same average kinetic energy.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

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