Question

A burning candle is covered by a jar as shown in the picture. The whole arrangement has a mass of 500 g. What will be the approximate mass of the arrangement when the candle is completely burnt, after four minutes?
A) 0 g
B) 50 g
C) 250 g
D) 500 g

Answer 1

The law of conservation of matter is that the amount of matter you begin the reaction with is the amount you will end up with.  So if you start with 500g of matter, when you burn the candle you will also have 500g of matter to end with.  SO D is your answer