What is the molar mass of Mn2O7

221.88 g/mol

General Formulas and Concepts:

Chemistry

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

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.