NEED HELP! URGENT! WILL MARK BRAINLIEST What is the oxidation number for “O” in ErO₂ ?
A. -6
B. -1
C. -4
D. 4
E. 2
-2
What is the oxidation number for “Er” in ErO₂ ?
A. -4
B. -2
C. +1
D. +2
E. +4

What is the oxidation number for “At” in AtO₃⁻ ?
A. +5
B. +7
C. -2
D. +3
E. -6

What is the oxidation number for “O” in AtO₃⁻ ?
A. -6
B. -4
C. +4
D. -2
E. -3
F. +2

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

In which reaction is precipitation occurring?

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.