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------------------------------------------------ Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

\[ 78.1 \, \text{g} \div 23.0 \, \text{mL} = ? \, \text{g/mL} \]
\[ 331.57 \, \text{mol} \div 54.4 \, \text{L} = ? \, \text{mol/L} \]

a) 169 g, 6.09 mol/L
b) 3.39 g, 169 mol/L
c) 3.39 g, 6.09 mol/L
d) 169 g, 169 mol/L

To calculate measurements involving significant figures, the number of significant digits in the result should match the least number in the original data, leading to answers of 3.39 g/mL and 6.09 mol/L.So, the correct option is (c).

Explanation:

This question involves the concept of significant figures in the context of multiplication and division within scientific measurements. Whether multiplying or dividing measurements, the result must be reported with the same number of significant figures as the measurement with the least number of significant figures.

For 78.1 g "/" 23.0 mL, since both measurements have three significant figures, the result will also have three significant figures, therefore the answer is 3.39 g/mL.
For 331.57 mol "/" 54.4 L, the least number of significant figures is 3, which are present in 54.4 L, so the quotient should also have three significant figures. The answer is then 6.09 mol/L.

With these calculations, the correct answer is (c) 3.39 g/mL, 6.09 mol/L.