How many significant figures in total do you have to use when using the electronic balance that has accuracy up to three figures after the decimal point that you used in the lab, to weigh a sample that is less than 10 grams.
9.345 is four significant digits.
To determine the number of significant figures required when using an electronic balance, we need to consider both the accuracy of the balance and the value of the sample being weighed.
In this case, the electronic balance has an accuracy of three figures after the decimal point. This means that the balance can measure values down to the nearest 0.001 grams (or 1 milligram).
Since the sample is less than 10 grams, we can assume that the balance is capable of accurately weighing the sample to at least 0.001 grams. Therefore, when measuring the sample, we would need to use three significant figures after the decimal point.
For example, if the balance reads 9.123 grams, we would report the result as 9.123 grams, as this value represents the accuracy of the balance.
In summary, when using an electronic balance with accuracy up to three figures after the decimal point to weigh a sample less than 10 grams, you would need to use three significant figures after the decimal point.