Number of moles of KOH present in solution is 3.75.
<h3>What do you mean by mole concept?</h3>
The term "mole" refers to a mole's atomic mass, which is expressed in grams. A mole is an element's gram-atomic mass, or mass.
The mole idea equates the mass of a single atom or molecule (measured in a.m.u.) to the mass (measured in grams) of a large collection of equivalent molecules.
To calculate moles of potassium hydroxide in 750 ml of 5.00 m of KOH solution -
Mathematically molarity is expressed as,
Molarity =no. of molecules of solute/volume of solution
Given: Molarity of solution = 5.00 M
Volume of solution = 750 ml = 0.750 l
∴ 5 = no. of moles/0.750
∴ number of moles = 3.75
Hence, number of moles of KOH present in solution is 3.75.
Learn more about mole concept ,here:
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<span>Negligible
or no change. In the chemistry of nitrogen bacteria convert nitrogen
from the AIR, and hydrogen from cell into cell bound ammonia
N2 + 3 H2 -> 2 NH3
But where does that H2 come from? From metabolic reactions in the cell
that produce CO2 and H2O. The partial pressure from the gas CO2
molecule pretty much replaces the partial pressure of the N2, and any
real pressure difference would be made up of respiration of the H20 from
the cell into the air.
</span>
Answer:
26, 25 mol of CO2 will be producer
Explanation:
For the resolution look at the attached image:
Answer:
The time required for the coating is 105 s
Explanation:
Zinc undergoes reduction reaction and absorbs two (2) electron ions.
The expression for the mass change at electrode 
is given as :
where;
M = molar mass
Z = ions charge at electrodes
F = Faraday's constant
I = current
A = area
t = time
also; = 
; replacing that into above equation; we have:
---- equation (1)
where;
A = area
d = thickness
= density
From the above equation (1); The time required for coating can be calculated as;
![[ \frac{20 cm^2 *0.0025 cm*7.13g/cm^3}{65.38g/mol}*2 \frac{moles\ of \ electrons}{mole \ of \ Zn} * 9.65*10^4 \frac{C}{mole \ of \ electrons } ] = (20 A) t](https://tex.z-dn.net/?f=%5B%20%5Cfrac%7B20%20cm%5E2%20%2A0.0025%20cm%2A7.13g%2Fcm%5E3%7D%7B65.38g%2Fmol%7D%2A2%20%5Cfrac%7Bmoles%5C%20of%20%5C%20electrons%7D%7Bmole%20%5C%20of%20%5C%20Zn%7D%20%2A%209.65%2A10%5E4%20%5Cfrac%7BC%7D%7Bmole%20%5C%20of%20%5C%20electrons%20%7D%20%20%5D%20%3D%20%2820%20A%29%20t)
= 105 s
Answer:
69.7231 u to 4 decimal places.
Explanation:
Gallium is composed of two natural occuring isotopes that is Ga-69(60.108%) with mass of 68.9256 amu and Ga-71(39.892%) with mas of 70.9247 amu. The ratio of their masses are 1.0290. The relative abundance of Ga-69 is 60.11% and Ga-71 is 39.89%.
Calculate average atomic mass of Ga-69 :
Ga-69 = 60.108% = 0.60108.
GA-71 = 39.892% = 0.39892.
Atomic mass of Ga = (68.9256⋅0.60108)+(70.9247⋅0.39892)
AM(Ga)=69.7231 u to 4 decimal places.
