Answer:
29.575%
Explanation:
Data provided:
Calories taken in daily diet = 2000
Recommended amount of fat = 65 grams
Average number of calories for fat = 9.1 calories / g
Thus,
Number of calories in the diet with average number of calories for fat
= Recommended amount of fat × Average number of calories for fat
= 65 × 9.1
= 591.5 calories
Therefore,
the percentage of calories in his diet supplied = ( 591.5 / 2000 ) × 100
= 29.575%
Answer: the last choice, It separates dissolved substances, which is a physical change.
Explanation:
Physical changes do not modify the composition of the substances.
The substances that undergo a physical change do not brake or form chemical bonds, they just modify ther appearance: the size, the physical state (solid, liquid, or solid), the density, the shape, that kind of properties.
The salts dissolved and the water will have the same chemical properties in solution and after being separated, so they have not had a chemical change, they have only changed their appearance, so this explains why it is a physical change.
<h3><u>Answer;</u></h3>
= 3.56 × 10^-5
<h3><u>Explanation and solution</u>;</h3>
A monoprotic acid is represented as HA,
Thus; HA →H+ + A-
Therefore; Ka = [H+] × [A-] / [HA]
[H+] = [A-] = Ca ×α
[HA] = Ca ×(1 - α)
α = dissociation % / 100 = 0.0155
Thus;
Ka = (0.146 × 0.0155)^2 / (0.146 × (1 - 0.0155))
<u> = 3.56 × 10^-5</u>
Answer:
The answer to your question is letter A
Explanation:
Abundance Atomic mass
V-50 0.25% 49.947
V-51 99.750% 50.944
Formula
Average atomic mass = [V-50-Abundance x V-50-Atomic mass] +
[ V-51-Abundance x V-51-Atomic mass]
Substitution
Average atomic mass = [ 0.0025 x 49.947] + [0.9975 x 50.944]
= 0.125 + 50.817
Result
= 50.942 amu
Answer:
21
Explanation:
Formula;
Mass number = number of protons + number of neutrons
= 9 + 12
= 21