calculate the grammes of oxygen which would be evolved on heating 5g of potassium trioxochlorate(v)

Answer 1

2 KClO3 gives on heating 2 KCl + 3 O2
245 g of KClO3 gives on heating 66 g of oxygen
Therefore 5 g of KClO3 gives on heating = 66/245 * 5 = 1.346 g of oxygen

Answer 2

chemistry and physics question

Answer 3

Your solution is incorrect check 3O2 =16*2*3=96g

Answer 4

Your solution is incorrect check 3O2 =16*2*3=96g not 66g