Question

Calculate the molar mass, in g/mol, for the compound strontium nitrate, Sr(NO3)2.

Answer 1

By definition, the molar mass for the compound strontium nitrate Sr(NO₃)₂ is 211.62 g/mole.

Definitio of molar mass

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

Molar mass of strontium nirate

In this case, you know the molar mass of the elements is:

• Sr= 87.62 g/mole
• N= 14 g/mole
• O= 16 g/mole

So, the molar mass of the compound Sr(NO₃)₂ is calculated as:

Sr(NO₃)₂= 87.62 g/mole + 2× (14 g/mole + 3×16 g/mole)

Solving:

Sr(NO₃)₂= 211.62 g/mole

Finally, the molar mass for the compound strontium nitrate Sr(NO₃)₂ is 211.62 g/mole.

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