I need help on this question

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 of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Summarize possible ways in which phases of matter could combine to form a solution.