When a given reaction is conducted in a calorimeter, energy is absorbed from the surrounding water and results in a decrease in
the water’s temperature. Which of the following best describes the difference in the potential energy of the reactants and products in this reaction?
The potential energy remains low before and after the reaction.
The potential energy of the reactants is higher than that of the products.
The potential energy of the reactants is much lower than that of the products
The potential energy of the reactants does not differ from that of the products.
The potential energy remains low before and after the reaction.
The potential energy of the reactants is higher than that of the products.
The potential energy of the reactants is much lower than that of the products
The potential energy of the reactants does not differ from that of the products.
2 answers:
Answer: The potential energy of the reactants is much lower than that of the products
Explanation: Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.
Thus as the reactants have absorbed energy from the surrounding water, the energy of the products will be higher and the reaction is termed as endothermic reaction.
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Answer:- 1.24 g
Solution:- The balanced equation for the formation of carbonic acid by the reaction of carbon dioxide with water is:
From balanced equation, there is 1:1 mol ratio between carbon dioxide and carbonic acid. So, moles of carbonic acid will be equal to the moles of carbon dioxide used.
Moles of carbon dioxide can be calculated using ideal gas law equation as it's volume, temperature and pressure are given.
we need to convert mL to L, degree C to kelvin and kilopascals to atm.
= 0.495 L
25 + 273 = 298 K
= 1 atm
Ideal gas law equation is:
PV = nRT
We want to find out the n, so let's rearrange this:
R is the universal gas constant and it's value is .
Let's pug in the values in the equation and solve it for n.
n = 0.02 mol
To convert the moles to grams we multiply the moles by the molar mass of carbonic acid.
Molar mass of carbonic acid = 2(1.008)+12.01+3(16.00)
= 2.016+12.01+48.00
= 62.03 gram per mol (rounded to two decimal places)
Let's multiply the moles by molar mass:
= 1.24 g
So, the theoretical yield of carbonic acid is 1.24 g.