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In 1983, the United States began coining the one-cent piece out of copper-clad zinc rather than pure copper. The mass of the old copper penny is 3.083 g and that of the new cent is 2.517 g. The density of copper is 8.920 g/cm and that of zing is 7.133 g/cm. The new and old coins have the same volume. Calculate the percent of zinc (by volume) in the new cent.

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Bryllant Baluyut
Bryllant BaluyutLv10
4 Nov 2020

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Figure .19.

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Practice Problem Set 1

l. A common approach to calibrate a piece of volumetric glassware is to fill the glassware with water of at a known temperature and then we the water using an analytical balance. The "true" volume e water is then calculated using the density of the water at the recorded temperature. This process is repeated several times to get an average "true" volume of water and an error in the value,

You decide to perform such an experiment on a 10.0 mL volumetric flask, filling the flask to the mark with pure Dl water at 22 C five separate times and then weighing the water added by difference using an analytical balance. You obtain the following results with the analytical balance.

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Exp 2 10.0345 g

Exp 3 10.0558 g

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a) What is the new concentration (M) of the KHP solution and the error in this value?

b) By how much in percent did the concentration of the KHP solution change from when you made it to when you used it?

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