Final answer:
When performing calculations using measurements, it's important to consider significant figures. In this case, the calculation is 342.1 g / (17.8 mL - 12.8 mL). The final answer with the correct number of significant figures is 68 g/mL.
Step-by-step explanation:
When performing calculations using measurements, it's important to consider significant figures. Significant figures are the digits in a number that carry meaning in terms of precision. In this case, we need to determine the answer with the correct number of significant figures to the given calculation.
The calculation is 342.1 g / (17.8 mL - 12.8 mL). Let's perform the calculation:
17.8 mL - 12.8 mL = 5.0 mL
342.1 g / 5.0 mL = 68.42 g/mL
Now, let's determine the answer with the correct number of significant figures. The least precise measurement in the calculation is 5.0 mL, which has two significant figures. Therefore, the final answer should also have two significant figures. Rounded to two significant figures, the answer is:68 g/mL