What is the rms speed of no2 at 400k? the mass is 7.64
x10-26 kg/mole.

Explanation:

The expression for the root mean square speed is:

R is Gas constant having value = 8.314 J / K mol  

M is the molar mass of gas

Molar mass of = 0.04599 kg/mol

Temperature = 400 K  

Thus,  

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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