Which of the following is the best example of the law of conservation of mass?
- A$12 \ g$ of carbon combines with $32 \ g$ of oxygen to form $44 \ g$ of $CO_2$
- BWhen $12 \ g$ of carbon is heated in a vacuum there is no change in mass
- C$A$ sample of air increases in volume when heated at constant pressure but its mass remains unaltered
- DThe weight of a piece of platinum is the same before and after heating in air
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