What’s the difference between internal stimuli and external stimuli

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

If the solubility of a gas in water is 1.22g/2.75 atm, what is it’s solubility (in g/l) at 1.0 atm

Acompound consisting of b, n, and h undergoes elemental analysis. the % composition by mass is found to be 40.28% b, 52.20% n, and 7.53% h. what is the empirical formula for this molecule? enter in the empirical formula in the form bxnyhz