Considering the definition of molar mass, 2.5 moles are in 265 grams of Na₂CO₃.
But first you have to know that molar mass is the mass of one mole of a substance, which can be an element or a compound.
In a compound the molar mass is equal to the sum of the weight or atomic mass of its atoms multiplied by their quantity.
In this case, the atomic mass of the elements of the compound are:
- Na: 23 g/mole
- C: 12 g/mole
- O: 16 g/mole
Then the atomic mass of the compound Na₂CO₃ is:
Na₂CO₃= 2× 23 g/mole + 12 g/mole + 3×16 g/mole
Na₂CO₃= 106 g/mole
Then you can apply the following rule of three: if by definition of molar mass 106 grams of the compound are contained in 1 mole, 265 grams are contained in how many moles?
[tex]amount of moles=\frac{265 gramsx1 mole}{106 grams}[/tex]
amount of moles= 2.5 moles
In summary, 2.5 moles are in 265 grams of Na₂CO₃.
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