The number of particles : 2.75 x 10²¹
<h3>Further explanation </h3>
A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
![\tt n=\dfrac{N}{N_o}](https://tex.z-dn.net/?f=%5Ctt%20n%3D%5Cdfrac%7BN%7D%7BN_o%7D)
N = number of particles
No = Avogadro number (6.02.10²³)
n = number of moles
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
0.75 gram sample of Calcium Nitrate; Ca(NO₃)₂
MW of Ca(NO₃)₂ : 164.09 g/mol
![\tt mol~Ca(NO_3)_2=\dfrac{0.75}{164.09}=0.00457](https://tex.z-dn.net/?f=%5Ctt%20mol~Ca%28NO_3%29_2%3D%5Cdfrac%7B0.75%7D%7B164.09%7D%3D0.00457)
The number of particles
![\tt N=n\times N_o\\\\N=0.00457\times 6.02\times 10^{23}=2.75\times 10^{21}](https://tex.z-dn.net/?f=%5Ctt%20N%3Dn%5Ctimes%20N_o%5C%5C%5C%5CN%3D0.00457%5Ctimes%206.02%5Ctimes%2010%5E%7B23%7D%3D2.75%5Ctimes%2010%5E%7B21%7D)
When two substances at different tempeartures como into contact, the substance that is at higher temperature will transfer energy, in the form of heat, to the substance that is at lower temperature, until their temperatures get equal.
In this case, if the two substances are isolated of the rest of the universe, the law of conservation of energy states tha the heat released by the substance initially at higher temperature is the same amount of heat gained by the substance originally at lower temperature.
cobalt has a larger atomic radius
Answer:
- Addition of NH₃(g)
- Removal of N₂(g)
- Increase of temperature
- Pressure decrease
Explanation:
According to Le Chatelier's principle, if we apply an stress to a reaction at equilibrium, the system will try to shift the equilibrium in order to decrease the stress. If we add reactants, the equilibrium will shift toward the formation of more products (to the consumption of reactants) and vice versa.
The stresses we can apply to this equilibrium are the following:
- Addition of NH₃(g) : it is a product, thus its addition will result in a shift toward reactants.
- Removal of N₂(g): it is a reactant, thus its removal from the reaction mixture will result in a shift toward reactants.
- Increase of temperature: the reaction is <u>exothermic</u>, so it releases energy. <u>Energy is a product</u>. If we add energy (increase the temperature), we are adding a product, so the equilibrium will shift toward the reactants.
- Pressure decrease: because both reactants and products are in the gas phase. A decrease in pressure shifts an equilibrium to the side of the reaction with greater number of moles of gas. In this case, the reactants side has greater number of moles of gas (1 mol + 3 moles= 4 moles) than the products side (2 moles). Thus, the equilibrum will shift toward reactants.
Answer:
The U.S. Federal Communications Commission (FCC)
Explanation: