Hello there.

Which atomic model describes the atom as a nucleus surrounded by electrons that may travel as waves in the electron cloud?

Rutherford's model.

4 0

3 years ago

How many zinc atoms are contained in 3.75 moles of zinc?

bija089 [108]

<h3>Answer:</h3>

2.26 × 10²⁴ atoms Zn

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.75 mol Zn (Zinc)

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 3.75 \ mol \ Zn(\frac{6.022 \cdot 10^{23} \ atoms \ Zn}{1 \ mol \ Zn})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 2.25825 \cdot 10^{24} \ atoms \ Zn$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

2.25825 × 10²⁴ atoms Zn ≈ 2.26 × 10²⁴ atoms Zn

3 0

3 years ago