<u>Answer:</u>
0.00926
<u>Explanation:</u>
no. of moles = mass ÷ molar mass (RMM)
Molar mass of Al is 27.
∴ no. of moles = 0.25 ÷ 27
= 0.00926 moles (3 s.f.)
Answer :
1.80 x 10^-4 moles/liter OH-
Explanation:
pH = 3.58 ; [H3O+] = 10^-3.58 = 2.63 x 10^-4 moles/liter
pH = 4.08 ; [H3O+] = 10^-4.08 = 8.32 x 10^-5 moles/liter
One needs to remove:
2.63 x 10^-4 moles/liter – 8.32 x 10^-5 = 1.80 x 10^-4 moles H3O+/liter
According to the equation: H3O+ + OH-=⇒ 2H2O
Moles/ liter of OH- needed:
1.80 x 10^-4 moles H3O+/liter x 1 mole OH-/1mole H3O+ = 1.80 x 10^-4 moles/liter OH-
Plant respiration , animal respiration , factory emission
Explanation:
A.
P = Ds * g * h
Height, h = 5053 ft
In m,
1541.165 m
g = 9.81 m/s^2
SG = density of substance, Ds/density of water
1.03 = Ds/1000
= 1030 kg/m^3
P = 1030 * 9.81 * 1541.165
= 1.56 x 10^7 N/m^2
1 Psi = 6894.76 Pa = 6894
76 N/m^2
= 2258.6 psig.
B.
Pressure = 4400 psig
Since,
1 Psi = 6894.76 Pa = 6894
76 N/m^2
= 3.03 x 10^7 Pa
Density = 3.03 x 10^7/(1541.165 * 9 81)
= 2006.6 kg/m^3
SG = density of substance, Ds/density of water
= 2006.6/1000
= 2.01.
C.
Density of barite = 4.370 * 1000
= 4370 kg/m^3
Total mass of slurry = mass of barite + mass of seawater
= 1030 + 4370
= 5400 kg in 1 m3 of slurry.
Mass fraction = mass of barite/total mass of slurry
= 4370/5400
= 0.81.
D.
The mud weight is a key factor. Too low mud weight may result in collapse problems, hence spill of the well will not be contained. This is because of the pressure of escaping oil against a column of fluid (the mud) having a density significantly higher than those of seawater and oil.
Answer:
CH2O is formaldehyde a covalent compound and its intermolecular forces are week
KCl is an ionic compound formed by electrostatic force of attraction between positive and negative charge. Ionic compounds also exists in three dimensional crystal lattic that is why intermolecular forces in KCl is stronger.
Moreover melting point of KCl is higher than CH2O
Explanation: