Question

What is the ratio of kinetic energies of 3g of hydrogen and 4g of oxygen at t k?

Answer 1

Hey mate here is the answer to your question

Given:  $4\:\text{grams}$ of oxygen

And $3\:\text{grams}$ of hydrogen

Now we take the average kinetic energy formula as:

Average  $K.E.= \frac{2}{3} kT$

As $H_2 =2 \:moles$

And Oxygen = $32\: moles$

We get as:

$\frac{3}{2} = 1.5\\\\\frac{4}{32}  = 0.125$

So ratio gives $\bold{1.5:0.125}$

Hope this answer will be helpful

Answer 2

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Since the temperature is same for the two gases,we can write the ratio of kinetic energies is in the moles of ${H2}$: moles of ${O2}$.

$\frac{3g ofH2}{2g m^-1}$:$\frac{4g ofO2}{32g mol^-1}$=$\frac{3}{2}$:$\frac{1}{8}$=${12:1}$.