Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this question. A solution is made of 300 grams of ethanol
(C2H5OH)
and 500 grams of water.
What is the mole fraction of ethanol in this solution?
O 0.19 M
O 0.81
O 0.81 M
O 0.19

Ithink the answer is a or d.

Idon't know hope someone you

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻

Mistures i think, hope it