Question

4.90 gram of KCLO3 is heated. it shows a weight loss of 0.384 gram . what is he percent of original KCLO3 which has decomposed .

Answer 1

The problem is worded in a confusing manner. I think the weight loss represents the decomposed part.
% = (0.384/4.90)*100 = ?

If you want the percent remaining of the original it is [(4.90-0.384)/4.90]*100 = ?

Answer 2

20.2