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A student finds that the weight of an empty beaker is 19.799 g. She places a solid in the beaker to give a combined mass of 19.862 g. To how many significant figures is the mass of the solid known?

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sqdancefan

Answer:

  2

Step-by-step explanation:

The difference between the two masses is 0.063 g, a number having 2 significant figures.

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Comment on this answer

Since each measurement has a precision of ±0.0005 g, the difference has a precision of ±0.001 g, which is to say that the least-significant digit of 0.063 g is uncertain. The actual precision is slightly less than 2 significant figures.

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