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dimulka [17.4K]
3 years ago
6

Which is an endothermic process? A. The process in which a substance loses heat energy B. The process in which a substance loses

kinetic energy C. The process in which the molecular motion of a substance decreases D. The process in which a substance gains energy
Chemistry
1 answer:
pentagon [3]3 years ago
5 0

Answer:

D. The process in which a substance gains energy

Explanation:

An endothermic reaction is a reaction in which heat energy is absorbed from the surroundings therefore we can imply that in such reaction, the substances gains energy. In endothermic reactions, the surrounding becomes colder at the end of the changes.

Here, the heat energy level of the final state is higher than that of the initial state. Most dissolution reactions are endothermic in nature. Examples are dissolution of Sodium chloride in water.

Note: it is in exothermic reaction that heat energy is liberated to the surrounding

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In the reaction BaCO3 + 2HNO3 + Ba(NO3)2 + CO2 + H2O, what mass of Ba(NO3)2 can be formed by combining 55 g BaCO3 and 26 g HNO3
Nataliya [291]

From the stoichiometry of the reaction, the mass of barium nitrate produced is 54.9 g.

<h3>Stoichiometry</h3>

The term stoichiometry refers to mass - volume relationships. Stoichiometry can be used to calculate the amount, mass or volume of reactants and products from the balanced reaction equation.

The equation of the reaction is written as follows;

BaCO3 + 2HNO3 ------>  Ba(NO3)2 + CO2 + H2O

Number of moles of BaCO3  = 55 g/197.34 g/mol = 0.28 moles

Number of moles of HNO3 = 26 g/63.01 g/mol = 0.41 moles

From the reaction equation;

1 mole of BaCO3 reacts with 2 moles of HNO3

0.28 moles of BaCO3 reacts with 0.28 moles ×  2 moles/1 mole = 0.56 moles

There is not enough HNO3 hence it is the limiting reactant.

Number of moles of Ba(NO3)2 produced  is obtained from;

2 moles of HNO3  yields 1 mole of Ba(NO3)2

0.41 moles of HNO3  yields 0.41 moles × 1 mole/2 moles

= 0.21 moles of Ba(NO3)2

Mass of  Ba(NO3)2  = 0.21 moles  × 261.337 g/mol = 54.9 g

Learn more about stoichiometry: brainly.com/question/9743981

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Explanation:

When water vapour changes to liquid water then this process is known as condensation.

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