Final answer:
To determine the number of grams of Zn₂ present in 1.51 grams of zinc oxide, calculate the molar mass of Zn₂, use stoichiometry to convert from grams of zinc oxide to grams of Zn₂.
Step-by-step explanation:
To determine the number of grams of Zn₂ present in 1.51 grams of zinc oxide, we need to calculate the molar mass of Zn₂ and then use stoichiometry to convert from grams of zinc oxide to grams of Zn₂.
Zinc oxide (ZnO) has a molar mass of 81.38 g/mol, while Zn₂ has a molar mass of 65.38 g/mol. The molar mass of Zn in ZnO is 65.38 g/mol.
Using the formula ZnO -> Zn + 1/2O₂, we can set up a stoichiometry calculation:
- Convert 1.51 grams of ZnO to moles of ZnO using its molar mass.
- Convert moles of ZnO to moles of Zn using the stoichiometric ratio of ZnO to Zn.
- Convert moles of Zn to grams of Zn using the molar mass of Zn.
By following these steps, we find that there are approximately 0.996 grams of Zn₂ present in 1.51 grams of zinc oxide.