What mass of #"potassium chlorate"# is required to produce a #2.24*L# volume of dioxygen gas at #"NTP"#?
We need (i) a stoichiometric equation, and (ii)......
and........(ii) we need the molar volume at
Now as regards (i)......
The reaction generally works well if you add some
And so moles of dioxygen gas......
And so the molar quantity of
Look at the question again, are you sure that it did not ask for