The answer is B, oxygen. Oxygen and hydrogen compose a water molecule, and since water molecules have a bent molecular geometry and oxygen is significantly more electronegative, the molecule is also polar. Oxygen attracts the shared electron, creating a negative pole, and the hydrogen areas of the molecule form a positive pole.
So the question ask to calculate the Ks of the monoprotic acid where as it is dissolved in water to produce 0.0136 M solutions and the PH result of the solutions is 2.45. So the Ka of the problem is 1.25 x 10^-3. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications about the problem
1297 grams of ore are needed to obtain 454.0 grams of Fe.
As the iron ore sample if found to be 35 percentage by mass
It means 35g of iron is present in 100g of ore.
1g of iron is present in 100/35 g of ore
And 454.0 g of iron is present in 100 × 454 / 35
= 1297.14 or 1297 grams (approx.)
The mass percent is calculated by dividing the mass of the compound or solute by the mass of the element or solute. A percent is obtained by multiplying the result by 100.
The formula for an element's percentage in a compound is as follows:
mass percent is calculated by multiplying the mass of the element in one mole of the compound by one hundred.
A solution follows this formula:
(gm of solute / gm of solute plus solvent) × 100 equals mass percent.
or
(gm of solute/grams of solution) x 100 Equals mass percent
Hence, 1297 grams of ore are needed to obtain 454.0 grams of Fe.
Learn more about Mass percent here brainly.com/question/26150306
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Hi, these are the answers:-
Thigh bone → Organ
Living cell → Cell
Bone cells working together→ Tissue
All the bones, cartilages and ligaments→ Organ System
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(Answered by Benjemin)