What is the molar mass of Mn2O7

221.88 g/mol

General Formulas and Concepts:

Chemistry

Reading a Periodic Table

Explanation:

Step 1: Define

Mn₂O₇

Step 2: Identify

Molar Mass of Mn - 54.94 g/mol

Molar Mass of O - 16.00 g/mol

Step 3: Find MM

Molar Mass of Mn₂O₇ - 2(54.94) + 7(16.00) = 221.88 g/mol

Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.

Not a  mixture of two common elements that can be separated by physical means.