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Measurement

Counting significant digits when measurements are multiplied or divided

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

[tex]\[
\begin{array}{l}
484.00 \, \text{m} \div 84.83 \, \text{s} = \square \, \frac{\text{m}}{\text{s}} \\
552.2 \, \text{g} \div 32.87 \, \text{mL} = \square \, \frac{\text{g}}{\text{mL}} \\
20.9476 \, \frac{\text{mol}}{\text{L}} \times 26 \, \text{L} = \square \, \text{mol}
\end{array}
\][/tex]


Sagot :

Certainly! Here is a detailed, step-by-step solution to the question:

### Problem 1: Division of Measurements
[tex]\( \frac{484.00 \, m}{84.83 \, s} = \square \frac{m}{s} \)[/tex]

1. Identify significant figures:
- 484.00 has 5 significant figures.
- 84.83 has 4 significant figures.

2. Perform the division:
[tex]\[ \frac{484.00 \, m}{84.83 \, s} \approx 5.7055 \frac{m}{s} \][/tex]

3. Determine the significant figures for the result:
- The result should have the same number of significant figures as the measurement with the fewest significant figures, which is 4 significant figures.

Therefore, the result is:
[tex]\[ 5.7055 \frac{m}{s} \][/tex]

### Problem 2: Division of Measurements
[tex]\( \frac{552.2 \, g}{32.87 \, mL} = \square \frac{g}{mL} \)[/tex]

1. Identify significant figures:
- 552.2 has 4 significant figures.
- 32.87 has 4 significant figures.

2. Perform the division:
[tex]\[ \frac{552.2 \, g}{32.87 \, mL} \approx 16.7995 \frac{g}{mL} \][/tex]

3. Determine the significant figures for the result:
- The result should have the same number of significant figures as the measurement with the fewest significant figures, which is 4 significant figures.

Therefore, the result is:
[tex]\[ 16.7995 \frac{g}{mL} \][/tex]

### Problem 3: Multiplication of Measurements
[tex]\( 20.9476 \frac{mol}{L} \times 26 \, L = \square \, mol \)[/tex]

1. Identify significant figures:
- 20.9476 has 6 significant figures.
- 26 has 2 significant figures.

2. Perform the multiplication:
[tex]\[ 20.9476 \frac{mol}{L} \times 26 \, L \approx 544.64 \, mol \][/tex]

3. Determine the significant figures for the result:
- The result should have the same number of significant figures as the measurement with the fewest significant figures, which is 2 significant figures.

Therefore, the result is:
[tex]\[ 544.64 \, mol \][/tex]