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When a 10 mL graduated cylinder is filled to the 10 mL mark, the mass of the water was measured to be 10.085 g at 20ºC. If the density of water is taken to be 0.9975 g/mL at 20ºC, what is the percent error for the 10 mL of water?
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Answer

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Step 1:
Let's solve this step by step:

Step 2:
: Identify the given information

- Accepted density of water at 20ºC: $$0.9975 \mathrm{~g/mL}
- Measured mass: 10.085 \mathrm{~g}

Step 3:
: Calculate the expected mass using the accepted density

m_{expected} = V \times \rho = 10 \mathrm{~mL} \times 0.9975 \frac{\mathrm{g}}{\mathrm{mL}} = 9.975 \mathrm{~g}

Step 4:
: Calculate the percent error using the formula

\text{Percent Error} = \left|\frac{m_{measured} - m_{expected}}{m_{expected}}\right| \times 100\%

Step 5:
: Plug in the values

\text{Percent Error} = \left|\frac{10.085 \mathrm{~g} - 9.975 \mathrm{~g}}{9.975 \mathrm{~g}}\right| \times 100\%

Step 6:
: Calculate the percent error

\text{Percent Error} = \left|\frac{0.110 \mathrm{~g}}{9.975 \mathrm{~g}}\right| \times 100\% = 1.10\%

Final Answer

The percent error is 1.10%.