I believe it is a Covalent Bond because 1st off, Calcium sulfide is made up of 2 elements, Calcium (Na) and Sulfer (S). Both elements want to obtain 8 electrons to become balanced (An octet) so therefore, these electrons are shared between these 2 elements.
Answer:
198.8mL
Explanation:
Step 1:
Data obtained from the question:
Molarity of base (Mb) = 3.5M
Volume of base (Vb) =..?
Molarity of acid (Va) = 2.75M
Volume of acid (Va) = 253mL
Step 2:
The balanced equation for the reaction.
HF + LiOH —> LiF + H2O
From the balanced equation above,
The mole ratio of the acid (nA) = 1
The mole ratio of the base (nB) = 1
Step 3:
Determination of the volume of the base, LiOH needed for the reaction.
The volume of the base needed for the reaction can be obtained as follow:
MaVa /MbVb = nA/nB
2.75 x 253 / 3.5 x Vb = 1
Cross multiply
3.5 x Vb = 2.75 x 253
Divide both side by 3.5
Vb = 2.75 x 253 / 3.5
Vb = 198.8mL
Therefore, the volume of the base needed for the reaction is 198.8mL
Answer:
I think it the second one adding external weight or the third one
Explanation:
I could never. im more like the last one
I'm really sorry if this was no help
Answer:
P(total) = 6.7 atm
Explanation:
Given data:
Partial pressure of N₂ = 3.5 atm
Partial pressure of O₂ = 2.8 atm
Partial pressure of Ar = 0.25 atm
Partial pressure of He = 0.15 atm
Total pressure = ?
Solution:
According to the Dalton law of partial pressure,
"The total pressure inside the gas cylinder having mixture of gases is equal to the sum of partial pressures of individual gas present in it"
Mathematical expression:
P(total) = P₁ + P₂ + P₃ + .........Pₙ
Now we will determine the total pressure of given gases.
P(total) = P₁ + P₂ + P₃ + P₄
P(total) =P(N₂) + P(O₂) + P(Ar) + P(He)
P(total) = 3.5 atm + 2.8 atm + 0.25 atm + 0.15 atm
P(total) = 6.7 atm