7 valence electrons. Hopefully that's right
Answer:
13. 
This is a double displacement reaction, not an acid-base reaction
14.
15. 
16.
17.
18.
19.
20.
21. 
22.
23.
24. 
Explanation:
All acid-base reaction have the same products, 
and a salt. Whit this in mind the acids would the compounds that produces the hydronium ion 
and the bases would be the compounds that produces the hydroxide ion 
The answer is:
E per gram = 0.45 V
The explanation:
when MnO2 is the substance who oxidized here so, the oxidizing agent and the anode here is Li.
and when the molar mass of Li is = 7 g/mol
and in our reaction equation we have 1 mole of Li will give 3.15 V of the electrical energy
that means that :
7 g of Li gives → 3.15 V
So 1 g of Li will give→ ???
∴ The E per gram = 3.15 V / 7 g of Li
= 0.45 V
Dependent variables have to be in the experiment for it to work
independent variables do not.
