Question

Plz help me with this problems

Answer 1

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:

`Density=(Mass)/(Volume)`

Here, 2 elements are given

For iron, Mass = 32.0 g

Volume = 4.0 mL

`\text{Density of element iron}=(32g)/(4mL)=8g/mL`

For Zinc, Mass = 42.0 g

Volume = 6.0mL

`\text{Density of element zinc}=(42g)/(6mL)=7g/mL`

For Topic 3

% error is calculated by:

`\% error=\frac{\left |\text{(Measured value-Accepted value)} \right |}{\text{Actual value}}* 100`

For iron,

Actual density of iron = 7.86 g/mL

`\% \text{error of iron}=(\left |8-7.86 \right |)/(8)* 100`

% error of iron = 1.78 %

For Zinc,

Actual density of Zinc = 7.14 g/mL

`\% \text{error of zinc}=(\left |7-7.14 \right |)/(7)* 100`

% error of iron = 1.98 %