Final answer:
To find the number of moles in 7.16x10^24 molecules of sodium carbonate, we need to use Avogadro's number. The molar mass of Na2CO3 is approximately 105.99 g/mol.
Step-by-step explanation:
To find the number of moles in 7.16x10^24 molecules of sodium carbonate, we need to use Avogadro's number, which states that there are 6.02 × 10^23 particles in one mole of a substance.
First, we determine the molar mass of sodium carbonate (Na2CO3) by adding up the atomic masses of each element: Na (sodium) = 22.99 g/mol, C (carbon) = 12.01 g/mol, and O (oxygen) = 16.00 g/mol. The molar mass of Na2CO3 is approximately 105.99 g/mol.
Now, we can use this information to calculate the number of moles:
Number of moles = Number of molecules / Avogadro's number
Plugging in the values:
Number of moles = 7.16x10^24 molecules / 6.02x10^23 particles/mol
After simplifying, the answer is approximately 11.9 moles.