1. What is the density (in g/cm) of a board whose length is 199 cm, width is 10.6 cm, and height is 5.54 cm and whose mass is 28600 g? Work: Calculated # sig figs: Final with units:

Answerstudying coal cumbustion as an energy source;

The answer is d for this question

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⁻

Answerreleasing energy.;