Question

How many moles of tin, Sn, are in 2500 atoms of tin?

Answer 1

Answer:

4.2 × 10⁻²¹ moles Sn

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Chemistry

Atomic Structure

• Using Dimensional Analysis
• Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

2500 atoms Sn

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

1. Set up:                              $\displaystyle 2500 \ atoms \ Sn (\frac{1 \ mol \ Sn}{6.022 \cdot 10^{23} \ atoms \ Sn})$
2. Multiply:                            $\displaystyle 4.15144 \cdot 10^{-21} \ moles \ Sn$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.15144 × 10⁻²¹ moles Sn ≈ 4.2 × 10⁻²¹ moles Sn