Chem homework help?
I need help with both of these questions and how to get the answers
- anonymousLv 73 weeks agoBest answer
4 Al(s) + 3 O₂(g) ⟶ 2 Al₂O₃(s)
aluminum oxide Al₂O₃ :
The charge of an aluminum ion is +3, and the charge of an oxygen ion is -2, so you need 2 Al³⁺ ions and 3 O²⁻ ions to balance the charges.
number of moles of silver in the sample:
(7.55 g Ag) x (1 mole Ag / 107.87 g Ag) = 0.0700 mole Ag
number of moles of sulfur in the sample:
(1.12 g S) x (1 mole S / 32.07 g S) = 0.0350 mole S
Find mole ratio by dividing each of those results by the smallest number of moles:
Ag: (0.0700 / 0.0350) = 2
S: (0.0350 / 0.0350) = 1
empirical formula is Ag₂S