Answer: A. and D.
Explanation: The relationship between internal energy change and enthalpy change during a chemical reaction occurs according to the following formula:
So, for changes in enthalpy and internal energy to be equal volume or pressure has to be constant, i.e., zero.
Change in the number of moles of gas during the reaction can make the difference between and be larger, so for them to be equal and pressure constant, number of moles must be the same in reagents and products.
Analysing each reaction above:
Reaction A has the same number of moles in reagents and products, so enthalpy change and internal energy change will be equal;
Reactions B and C don't have the same number of moles at both sides, so enthalpy and energy will be different.
Reaction D, although reagent side have 2 compounds, carbon is solid, so reaction have the same number of moles in both sides. Enthalpy and Energy will be equal.
Answer:36 grams of water is produced. Law of conservation of matter states that mater cannot be created or destroyed. 16 grams of methane added to 64 grams of oxygen equals 80 total grams of reactants. 80 grams minus 44 grams of carbon dioxide is 36. This means there must be 36 grams of water, and you end with the same mass of reactants as in the beginning. Hope this helps! Good luck!
Explanation:
Answer: grasshoppers produce sounds to attract mates or protect territory.
Explanation: Like their cricket cousins, grasshoppers produce sounds to attract mates or protect territory. Grasshoppers can be identified by their unique songs, which differ slightly from species to species. Grasshoppers stridulate by rubbing their wings together in the same manner as crickets.
Answer:
80 ml
Explanation:
Moles to start = .04 L * .6 M/L = .024 moles
this is how much must be in the final dilution
.2 moles / liter * x liter = .024 moles
x = .024 / .2 = .12 liter final volume
start with . 040 then add .080 to get .12 liter
.080 liter = 80 ml