These questions are on gas laws.

If I had 25.0 grams of methane, how many moles of CH4 would I have?

If I had the above moles of methane in a sealed 1.55 Liter container at 25C, what would be the pressure in the container in the atmosphere?

.If I cooled down the same number of moles in the same container to 12C what would be the pressure in the atmosphere?

Did the pressure in the container increase or decrease? Explain why it happened.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

i wish i could but this one is weird give me abc and i can solve it.