1. Calculate the molar mass of N2O5:
* N: 14.01 g/mol (x2 = 28.02 g/mol)
* O: 16.00 g/mol (x5 = 80.00 g/mol)
* Total molar mass of N2O5 = 28.02 g/mol + 80.00 g/mol = 108.02 g/mol
2. Calculate the number of moles of N2O5:
* Moles = Mass / Molar Mass
* Moles = 1296 g / 108.02 g/mol = 12 mol
3. Calculate the number of molecules:
* Use Avogadro's number (6.022 x 10^23 molecules/mol)
* Number of molecules = Moles x Avogadro's number
* Number of molecules = 12 mol x 6.022 x 10^23 molecules/mol = 7.226 x 10^24 molecules
Therefore, there are approximately 7.226 x 10^24 molecules of N2O5 present in 1296 g.
