Determine the mass in grams of 2.71 x 10^21 atoms of arsenic if the mass of one mole is 74.92g

0.337 g As

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Chemistry

Atomic Structure

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

Stoichiometry

Using Dimensional AnalysisExplanation:

Step 1: Define

[Given] 2.71 × 10²¹ atoms As

[Solve] grams As

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of As - 74.92 g/mol

Step 3: Convert

[DA] Set up:                                                                                                      [DA] Multiply/Divide [Cancel out units]:                                                        

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.337152 g As ≈ 0.337 g As

The answer should be c.