Answer: released to; absorbed from
- In an exothermic reaction, energy is released to the surroundings.
- In an endothermic reaction, energy is absorbed from the surroundings.
Explanation:
An exothermic reaction is a chemical reaction that occurs spontaneously and brings about the release of energy to the surroundings. Hence, the reacting vessel feels hot as the reaction proceeds.
An endothermic reaction, on the other hand, does not occur spontaneously and proceed only when energy is absorbed from the surroundings. Hence, the reacting vessel feels cold as the reaction proceeds.
Limitations of Van der waal's equation. (i) The value of 'b' is not constant but varies with pressure and temperature. (ii) The value of is not equal to 3b, but actually it is equal to, in some case; and in other cases 2b. (iii) The value of is not equal to but it is usually more than 3 for most of the gases.
Answer:
the particles would not change. solids have definite shape and volume
Explanation:
The mass of dinitrogen tetroxide the number of Nitrogen atoms are 46 x 10^9 gram
Given:
number of nitrogen atoms = 1 x 10^12 atoms
To Find:
mass of dinitrogen tetroxide
Solution:
From the molecular formula of dinitrogen tetraoxide;
molar mass of dinitrogen tetraoxide = 92 g/mol
92 g of dinitrogen tetraoxide contains 2 atoms of nitrogen
x g of dinitrogen tetraoxide will contain 1 * 10^12 atoms of nitrogen
x = 92*1* 10^ 9/2
x = 46 x 10^9 gram
Hence, the number of Nitrogen atoms are
Hence, the number of Nitrogen atoms are 46 x 10^9 gram
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