Plug in any number that yo think it’s the answer and make a t chart and put every letter in it and the other side the number until it is balanced
Answer:
q1..no.2 and 4 are aromatic
2KClO₃ → 2KCl + 3O₂
mole ratio of KClO₃ to O₂ is 2 : 3
∴ if moles of O₂ = 5 mol
then moles of KClO₃ =

= 3.33 mol
Mass of KClO₃ needed = mol of KClO₃ × molar mass of KClO₃
= 3.33 mol × ((39 × 1) + (35.5 × 1) + (16 × 3) g/mol
= 407.93 g
Must be C because the liquid fuel is Codium nitrate to be used in rocket engines
I'm guessing water vapour. i can't think of any other gas limited to only hydrogen and oxygen
hope it helps :)