Answer: For topic 2
Density of Iron = 8 g/mL
Density of Zinc = 7 g/mol
For topic 3
% error for Iron = 1.78%
% error for Zinc = 1.96%
Explanation:
For Topic 2
Density is calculated by using the formula:
[tex]Density=\frac{Mass}{Volume}[/tex]
Here, 2 elements are given
For iron, Mass = 32.0 g
Volume = 4.0 mL
[tex]\text{Density of element iron}=\frac{32g}{4mL}=8g/mL[/tex]
For Zinc, Mass = 42.0 g
Volume = 6.0mL
[tex]\text{Density of element zinc}=\frac{42g}{6mL}=7g/mL[/tex]
For Topic 3
% error is calculated by:
[tex]\% error=\frac{\left |\text{(Measured value-Accepted value)} \right |}{\text{Actual value}}\times 100[/tex]
For iron,
Actual density of iron = 7.86 g/mL
[tex]\% \text{error of iron}=\frac{\left |8-7.86 \right |}{8}\times 100[/tex]
% error of iron = 1.78 %
For Zinc,
Actual density of Zinc = 7.14 g/mL
[tex]\% \text{error of zinc}=\frac{\left |7-7.14 \right |}{7}\times 100[/tex]
% error of iron = 1.98 %
