Question

What is the mass in grams of 0.375 mol of the element potassium, K?

Answer 1

Mass = 14.7 g

Step-by-step explanation:

Given data:

Mass in g =?

Moles of K = 0.375 mol

Solution:

The Molar mass of potassium is 39.1 g/mol.

Formula

Number of moles = mass/molar mass

Mass = Number of moles × molar mass

Mass = 0.375 mol × 39.1 g/mol

Mass = 14.7 g

Answer 2

14.7 g K

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

• Reading a Periodic Table
• Using Dimensional Analysis

Step-by-step explanation:

Step 1: Define

0.375 mol K

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Step 3: Convert

1. Set up:
   `\displaystyle 0.375 \ mol \ K((39.10 \ g \ K)/(1 \ mol \ K))`
2. Multiply:
   `\displaystyle 14.6625 \ g \ K`

Step 4: Check

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

14.6625 g K ≈ 14.7 g K