The answer for the first question is A. Proton is the subatomic particles which adds most of the mass of an atom as well as the neutron since they have the same mass. Photon, on the other hand, is not one of the subatomic particles.
Answer:
89.88 g
Explanation:
Atomic Mass of Ar: 39.948
Mass = moles * AM
Replacing moles = 2.25 and AM = 39.948 you get the mass of Ar:
Mass = 2.25 * 39.948
Mass = 89.88 g
Answer: The pH of the solution is 11.2
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
![Molarity=\frac{n\times 1000}{V_s}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bn%5Ctimes%201000%7D%7BV_s%7D)
where,
n = moles of solute
= volume of solution in ml
moles of
=
(1g=1000mg)
Now put all the given values in the formula of molality, we get
![Molarity=\frac{0.00507\times 1000}{170}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7B0.00507%5Ctimes%201000%7D%7B170%7D)
![Molarity=0.0298](https://tex.z-dn.net/?f=Molarity%3D0.0298)
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
![pOH=-\log [OH^-]](https://tex.z-dn.net/?f=pOH%3D-%5Clog%20%5BOH%5E-%5D)
![Ba(OH)_2\rightarrow Ba^{2+}+2OH^{-}](https://tex.z-dn.net/?f=Ba%28OH%29_2%5Crightarrow%20Ba%5E%7B2%2B%7D%2B2OH%5E%7B-%7D)
According to stoichiometry,
1 mole of
gives 2 mole of
Thus 0.0298 moles of
gives =
moles of
Putting in the values:
![pOH=-\log[0.0596]=2.82](https://tex.z-dn.net/?f=pOH%3D-%5Clog%5B0.0596%5D%3D2.82)
![pH+pOH=14](https://tex.z-dn.net/?f=pH%2BpOH%3D14)
![pH=14-2.82](https://tex.z-dn.net/?f=pH%3D14-2.82)
![pH=11.2](https://tex.z-dn.net/?f=pH%3D11.2)
Thus the pH of the solution is 11.2
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