How do i find the number if electrons in an element

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

What is the number of moles in 15.0 g ash3?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo