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mash [69]
3 years ago
15

Hen solid kbr is dissoved in water, the solution gets colder. this is an example of a(n) ________ reaction.

Chemistry
1 answer:
Sonja [21]3 years ago
7 0
Endothermic reactions. These are reactionsthat take in energy from the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder
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What is the empirical formula for a substance if a 201.6 g sample of it contains 54.0 grams of nitrogen, 15.0 grams of hydrogen,
jeyben [28]

The empirical formula of the substance would be  NH_4Cl

<h3>Empirical formula calculation</h3>

The constituents of the compound are as follows:

N = 54/201.6 = 26.78% = 26.78/14 = 1.91 moles

H = 15/201.6 = 7.44% = 7.44/1 = 7.44 moles

Cl = 132.6/201.6 = 65.48% = 65.48/35.5 = 1.84 moles

Divide the number of moles by the smallest"

N = 1.91/1.84 = 1

H = 7.44/1.84 = 4

Cl = 1.84/1.84 = 1

Thus, the empirical formula is NH_4Cl

More on empirical formula can be found here: brainly.com/question/14044066

#SPJ1

6 0
2 years ago
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the atomic nucleus of nitroge
Varvara68 [4.7K]

The difference in the mass of the Nitrogen-14 and Nitrogen-15 atom is because nitrogen-15 has 8 neutrons while nitrogen-14 has 7 neutrons.

<h3>What is atomic mass of an element?</h3>

Atomic mass of an element is the sum of the masses of the protons and neutrons in the nucleus of an atom.

<h3>Why is the atomic mass of Nitrogen-14 and Nitrogen-15 different?</h3>

The difference in the mass of the Nitrogen-14 and Nitrogen-15 atom is due to the difference in the number of neutrons.

Nitogen-15 has 8 neutrons while nitrogen-14 has 7 neutrons.

Therefore, the difference in the mass of the Nitrogen-14 and Nitrogen-15 atom is because nitrogen-15 has 8 neutrons while nitrogen-14 has 7 neutrons.

Learn more about atomic mass at: brainly.com/question/8101390

5 0
3 years ago
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