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Alisiya [41]
3 years ago
15

If I have 12 protons, how many neutrons and electrons would I need to make a stable atom?

Chemistry
1 answer:
lesantik [10]3 years ago
3 0

Answer:

im pretty sure you need 15 in all but dont get mad it thats wrong, so you would i think need 3 neutrons

Explanation:

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A chlorine Cl and bromine Br atom are adsorbed on a small patch of surface (see sketch at right). This patch is known to contain
MrRissso [65]

Explanation:

It is given that possible number of ways the Cl and Br can be absorbed initially are 100.

S, possible number of ways by which Br can be desorbed is as follows.

                  100 \times 99

Now, we will calculate the change in entropy as follows.

               \Delta S = k_{B} ln (\frac{W}{W_{o}})

where,   k_{B} = Boltzmann constant = 1.38 \times 10^{-23}

             \Delta S = change in entropy

Therefore, we will calculate the change in entropy as follows.

             \Delta S = k_{B} ln (\frac{W}{W_{o}})

                         = 1.38 \times 10^{-23} J/K \times ln (\frac{100}{100 \times 99})

                        = 1.38 \times 10^{-23} J/K \times -4.595

                        = -6.34 \times 10^{-23} J/K

Thus, we can conclude that the change in entropy is -6.34 \times 10^{-23} J/K.

5 0
3 years ago
Define the standard heat of formation of mgco3
Karo-lina-s [1.5K]
The standard heat of formation is the energy change that occurs when 1 mole of a substance is made from its elements in their standard states ( most stable form of the element at 1 bar of pressure and the specified temperature, usually 298 K or 25 degrees Celcius) 
E.g for MgCO3
Mg (s) + C (s) + 3/2 O2 (g) = MgCO3
7 0
3 years ago
Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho
german

Answer:

The value is Z  =  311.33 \ g/mol

Explanation:

From the question we are told that

The mass of saxitoxin is m  =  12.5 mg = 12.5 * 10^{-6} g

The volume of water is V  =  3.10  mL  =  3.10 *10^{-3} L

The osmotic pressure is P =  0.236 =  \frac{0.236}{760}  =  3.105 * 10^{-4} atm

The temperature is T  =  19^oC  =  19 + 273 =  292 \  K

Generally the osmotic pressure is mathematically represented as

P  =  C  *  T  * R

Here R is the gas constant with value

R =  0.0821 ( L .atm /mol. K)

and C is the concentration of saxitoxin

So

3.105 * 10^{-4}  =  C * 0.0821   *  292

C = 1.295 *10^{-5} mol/L

Generally the number of moles of saxitoxin is mathematically represented as

n = C  *  V

=> n = 1.295 *10^{-5}   *3.10 *10^{-3}

=> n = 4.015 *10^{-8} \  mol

Generally the molar mass of saxitoxin is mathematically represented as

Z  =  \frac{m}{n}

=> Z  =  \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}

=> Z  =  311.33 \ g/mol

5 0
4 years ago
Complete the following equation of nuclear transmutation.
LiRa [457]

Answer:

Option A. 1 0n

Explanation:

Details on how to balanced the equation for the reaction given in the question above can be found in the attached photo.

4 0
4 years ago
What is produced on the top of a pool of water by the mutual attraction between water molecules?
forsale [732]
The answer is surface tension
6 0
3 years ago
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