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kyusra2008
20.01.2020 •
Chemistry
1. how do you determine how many digits to keep in an answer obtained by multiplying or dividing
2. how is the number of significant figures determined for an answer obtained by adding or subtracting
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Ответ:
The answer to your question is below
Explanation:
1.- The significant figures for multiplication or division is equal to the least number of significant figures in any number of the problem.
Example: 2.5 x 3.42 = 8.55
2.5 has two significant figures
3.42 has three significant figures
The result must have 2 significant figures, for the example the answer is
2.5 x 3.42 = 8.6
2.- The significant figures for addition and subtraction the answer must be rounded to the least number of significant figures in the problem.
Example
1.453 + 82.2 = 83.653
Adjust to the least number of significant figures
= 83.7
because 82.2 has only one significant figure after the decimal point.
Ответ: