During a lab activity, students calculate the density of an element to be 7.78 g/cm3. the density listed on the periodic table is 7.13 g/cm3. calculate the percent error and identify the element.

Percent error = 9.12 %

The element is zinc

Explanation:

The percent error can be calculated using the formula:

%error = * 100%

%error = * 100 % = 9.12%

To identify the element we need to look in the periodic table for any element that has such a density. In this case it's zinc, Zn.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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