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11.48-gram of are needed to produce 6.75 Liters of
gas measured at 1.3 atm pressure and 298 K
The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
First, calculate the moles of the gas using the gas law,
PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.
Given data:
P= 1.3 atm
V= 6.75 Liters
n=?
R=
T=298 K
Putting value in the given equation:
Moles = 0.3588 moles
Now,
Mass= 11.48 gram
Hence, 11.48-gram of are needed to produce 6.75 Liters of
gas measured at 1.3 atm pressure and 298 K
Learn more about the ideal gas here:
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Answer:
a. The pH of a sample of lemon juice with [H⁺] = 3.8*10⁻⁴ M is 3.4, indicating acidity.
b. The pH of a commonly available window-cleaning solution with [OH⁻] = 1.9*10⁻⁶ M is 8.28, indicating basicity.
c. The [H⁺] is 1.74*10⁻⁴ M.
d. The [OH⁻] is 1.51*10⁻⁵ M.
Explanation:
pH is a measure of acidity or alkalinity that indicates the amount of hydrogen [H⁺] or hydronium [H₃O⁺] ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of the hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺):
pH= -log₁₀ [H⁺]= -log₁₀ [H₃O⁺] or pH= -log [H⁺]= -log [H₃O⁺]
The pH scale ranges from 0 to 14. Values less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral.
<u><em>Case a</em></u>
You know [H⁺]= 3.8*10⁻⁴ M. Then:
pH= -log (3.8*10⁻⁴)
pH=3.42
<em>The pH of a sample of lemon juice with [H⁺] = 3.8*10⁻⁴ M is 3.4, indicating acidity.</em>
<u><em>Case b</em></u>
Like pH, pOH (or OH potential) is a measure of the basicity or alkalinity of a solution.
The pOH indicates the concentration of hydroxyl ions [OH-] present in a solution:
pOH= -log₁₀ [OH⁻]= -log [OH⁻]
The pOH is related to the pH by the formula:
pH + pOH= 14
In this case you know [OH⁻]=1.9*10⁻⁶ M. Then:
pOH= -log(1.9*10⁻⁶)= 5.72
So pH + 5.72= 14
pH= 14 - 5.72
pH= 8.28
<em>The pH of a commonly available window-cleaning solution with [OH⁻] = 1.9*10⁻⁶ M is 8.28, indicating basicity.</em>
<u><em>Case c</em></u>
You know pH=3.76. Then:
3.76= -log [H⁺]
-3.76= log [H⁺]
[H⁺]=
[H⁺]= 1.74*10⁻⁴ M
<em>The [H⁺] is 1.74*10⁻⁴ M.</em>
<u><em>Case d</em></u>
You know that pH + pOH=14 and pH is 9.18. Then
9.18 + pOH=14
pOH=14 - 9.18
pOH= 4.82
You know pOH= - log [OH⁻]. Then:
4.82= -log [OH⁻]
-4.82= log [OH⁻]
[OH⁻]=
[OH⁻]= 1.51*10⁻⁵ M
<em>The [OH⁻] is 1.51*10⁻⁵ M.</em>