0.075 L * 1.0 M = 0.075 mol HCl
H2 is half of HCl by the coefficients divide 0.075 by 2 and get 0.0375 mol H2 gas
H2O became a vapor when heated because thats the only one that can go back to its normal state, which is what a physical change is.
They are all equal to one mole (all of the above).
Idk it’s making me answer a question in order to get help on my own
