What is the molecular mass of MnO2?
Understand the Problem
The question is asking for the molecular mass of manganese dioxide (MnO2). To find this, we will sum the atomic masses of manganese (Mn) and oxygen (O) based on their quantities in the compound, which consists of one manganese atom and two oxygen atoms.
Answer
86.94 u
Answer for screen readers
The molecular mass of MnO2 is 86.94 u
Steps to Solve
- Find the atomic mass of manganese (Mn)
The atomic mass of Mn is approximately 54.94 u (atomic mass units).
- Find the atomic mass of oxygen (O)
The atomic mass of O is approximately 16.00 u.
- Calculate the total atomic mass contribution from oxygen
Since there are two oxygen atoms in MnO2, multiply the atomic mass of oxygen by 2: $$ 2 imes 16.00 ext{ u} = 32.00 ext{ u} $$
- Add the atomic masses to find the molecular mass of MnO2
Sum the mass of one Mn atom and the total mass of two O atoms: $$ 54.94 ext{ u} + 32.00 ext{ u} = 86.94 ext{ u} $$
The molecular mass of MnO2 is 86.94 u
More Information
Manganese dioxide (MnO2) is used in dry-cell batteries as a depolarizer, enabling the battery to produce a steady voltage.
Tips
A common mistake is to use incorrect atomic masses for the elements. Always refer to a reliable periodic table for accurate values.
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