Question

What is the molar mass for $ M{n_2}{O_7} $ ​, an oxide of manganese?

Answer 1

Hint :To answer this question, we first need to understand what molar mass is. The mass of a sample of a chemical compound divided by the amount of material in that sample, measured in moles, is the molar mass of that compound in chemistry. 1st In grammes, it is the mass of 1 mole of the substance, or $ 6.022 \times {10^{23}} $ particles. The molar mass of a substance is a bulk attribute, not a molecular attribute

Complete Step By Step Answer:
 $ M{n_2}{O_7} $ - The inorganic compound manganese (VII) oxide (manganese heptoxide) has the formula $ M{n_2}{O_7} $ . This extremely reactive liquid is frequently discussed rather than purposely manufactured. It was initially discovered in 1860 and is a harmful oxidant. It's permanganic acid's acid anhydride. This chemical compound has a dark green crystalline appearance. Reflected light turns the liquid green, whereas transmitted light turns it red. It decomposes when exposed to water and is soluble in carbon tetrachloride.
Molar mass of Mn $ = 54.94\dfrac{g}{{mol}} $ .
Molar mass of O $ = 16\dfrac{g}{{mol}} $ .
Then to find the molar mass of $ M{n_2}{O_7} $ ,
Total molar mass = Molar mass of Mn $ \times $ $ 2 $ + Molar mass of O $ \times $ $ 7 $
Here by substituting the value,
Total molar mass $ = (54.94 \times 2) + (16 \times 7) $
Total molar mass $ = 221.88\dfrac{g}{{mol}} $ .

Note :
The mass of a molecule in a substance is known as its molecular mass. Molecular weight is another name for it. The mass of one mole of a substance, or Avogadro's number of molecules in that substance, is referred to as molar mass. It's computed as the mass of one material molecule divided by the mass of one Carbon-12 atom.