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Gekata [30.6K]
4 years ago
7

4. How do the atomic numbers of the elements

Chemistry
1 answer:
aksik [14]4 years ago
6 0

Answer:

From the arrangement of electrons

Explanation:

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Atoms of elements in the same group have the same number of
kherson [118]

Answer:

electrons (can i have brainliest)

Explanation:

7 0
3 years ago
Read 2 more answers
The ΔH vap of a certain compound is 46.55 kJ⋅ mol−1 and its ΔS vap is 67.37 J⋅mol−1⋅K−1.
arsen [322]

690 Kelvin is the boiling point of this compound.

Explanation:

Enthalpy is the sum of internal energy and the product of pressure and volume that is how much energy is in the substance.

Entropy is the measurement of randomness and measure of thermal energy per unit of temperature.

ΔH vap of compound is 46.55 kJ⋅ mol− or  J.MOL-1

ΔS vap  is 67.37 J⋅mol−1⋅K−1.

The boiling point or temperature can be calculated by the formula:

T= \frac{ΔH vap}{ΔS vap}

T =\frac{46550}{67.37}      

  = 690 Kelvin

The boiling point is the temperature when atmospheric temperature gets equal to

4 0
3 years ago
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One mole of neon, a monatomic gas, starts out at conditions of standard temperature and pressure. the gas is heated at constant
Anna71 [15]
<span>We can use the ideal gas law PV=nRT For the first phase The starting temperature (T1) is 273.15K (0C). n is 1 mole, R is a constant, P = 1 atm, V1 is unknown. The end temperature (T2) is unknown, n= 1 mol, R is a constant, P = 3*P1= 3 atm, V2=V1 Since n, R, and V will be constant between the two conditions: P1/T1=P2/T2 or T2= (P2*T1)/(P1) so T2= (3 atm*273.15K)/(1 atm)= 3*273.15= 816.45K For the second phase: Only the temperature and volume change while n, P, and R are constant between the start and finish. So: V1/T1=V2/T2 While we don't know the initial volume, we know that V2=2*V1 and T1=816.45K So T2=(V2*T1)/V1= (2*V1*T1)/V1=2*T1= 2*816.45K= 1638.9K To find the total heat added to the gas you need to subtract the original amount of heat so 1638.9K-273.15K= 1365.75K</span>
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3 years ago
Nitric oxide gas reacts with hydrogen gas to form ammonia gas and water vapor.
AlexFokin [52]
What is your question?
5 0
4 years ago
Please hurry I'm in a test... 50 pts :)) HIGH SCHOOL CHEMISTRY
allochka39001 [22]

Answer:

A. Energy is absorbed because the product has more energy than the reactants have.

Here the energy of both reactants is combined together and not released.

3 0
3 years ago
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