In chemical equations, we usually state the state symbol behind each of the reactants and products. We use (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous solutions.
For example, here's an equation of sodium reacting with water:
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
As you can see, each behind each substance is the state symbol. This is how we presents physical states in chemical equations.
An atom's mass number is the sum of the numbers of protons and neutrons in its nucleus. The atomic weight is the average mass of all of the isotopes of that element.
Answer: ch4 + 2o2 --> co2 + 2h2o Now let's convert the grams of methane and oxygen to moles and see which one is the limiting reagent. 8 g methane (1 mole/16 g) = 0.5 mole methane
