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

Explanation:

Step1: Recall law of conservation of mass

In a closed - system (the jar is a closed - system here), mass is conserved during a chemical reaction (candle burning is a chemical reaction).

Step2: Analyze initial and final mass

The initial mass of the closed - system (jar + candle) is 500 g. Since mass is conserved in a closed - system, the final mass after the candle is completely burnt will be the same as the initial mass.

Answer:

D. 500 g