How many O2 molecules are needed to react with 5.99g of S
To determine the number of O2 molecules needed to react with 5.99g of S, we first need to determine the molar mass of S, which is 32.07 g/mol.
Next, we need to calculate the number of moles of S in 5.99g:
Number of moles = mass / molar mass
Number of moles = 5.99g / 32.07 g/mol = 0.187 moles
The balanced chemical equation for the reaction between S and O2 is:
2S + 3O2 → 2SO3
From the balanced equation, we can see that 2 moles of S react with 3 moles of O2.
Since we have 0.187 moles of S, we can calculate the number of moles of O2 needed:
Number of moles of O2 = (0.187 moles of S) x (3 moles of O2 / 2 moles of S)
Number of moles of O2 = 0.281 moles of O2
Finally, we convert moles of O2 to molecules:
Number of molecules = number of moles x Avogadro's number
Number of molecules = 0.281 moles x 6.022 x 10^23 molecules/mole
Number of molecules = 1.69 x 10^23 molecules
Therefore, 1.69 x 10^23 O2 molecules are needed to react with 5.99g of S.