Please help i have 20 min please it is required to prepare 250ml of potassium dichromate solution (S) of formula K2Cr207 of molar concentration 0.2mol/l.
1- calculate the mass of potassium dichromate needed to prepare (S).
2- calculate the mass concentration of (s).
3- write the dissociation equation.
4. determine the molar concentration of the ions.
5- Describe the procedure of preparation of solution (S).
given: K =39 Cr=52 0-16​

H tricky one let me think and get back to u

Answerit is not a renewable energy source;

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⁻

The answer is false