Berny has a 0.15-kilogram candle, a 1.00-kilogram jar, and a 0.25-kilogram candle holder. He places the candle and candle holder in the jar, lights the candle, and then immediately closes the jar.

Question

What should the total mass of the jar and its contents be after the candle goes out?
A.
1.00 kilogram
B.
1.40 kilograms
C.
1.15 kilograms
D.
1.25 kilograms

Answer 1

To find the total mass of the jar and its contents after the candle goes out, let's first calculate the mass of all the items involved:

1. Mass of the candle: 0.15 kg
2. Mass of the jar: 1.00 kg
3. Mass of the candle holder: 0.25 kg

Now, we add these masses together:

• Total mass = Mass of candle + Mass of jar + Mass of candle holder
• Total mass = 0.15 kg + 1.00 kg + 0.25 kg
• Total mass = 1.40 kg

When the candle burns, it converts wax into gas (products of combustion), but the total mass of the closed system (jar + contents) will remain constant due to the conservation of mass, as no matter can escape the closed jar.

Therefore, after the candle goes out, the total mass of the jar and its contents will still be 1.40 kilograms.

The correct answer is B. 1.40 kilograms.