Which variables are unknown?

pressure

volume

temperature

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

Why does his teacher ask him to balance the equation by including the correct coefficient

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)