the mass of a container is subtracted to find the mass of the sample. what is the mass, recorded to the…

the mass of a container is subtracted to find the mass of the sample. what is the mass, recorded to the appropriate number of significant figures?\n140.3 g\n- 120.124 g\n? g

the mass of a container is subtracted to find the mass of the sample. what is the mass, recorded to the appropriate number of significant figures?\n140.3 g\n- 120.124 g\n? g

Answer

Explanation:

Step1: Perform subtraction

$140.3 - 120.124=20.176$

Step2: Determine significant - figures for subtraction

When subtracting, the result should be rounded to the same number of decimal places as the number with the least number of decimal places in the values being subtracted. 140.3 has one decimal place and 120.124 has three decimal places. So we round 20.176 to one decimal place.

Step3: Round the result

Rounding 20.176 to one decimal place gives 20.2.

Answer:

20.2 g