Which of the following do you need to know to be able to calculate the molarity of a salt solution ? I. the mass of salt added II. the molar mass of the salt III. the volume of water added IV. the total volume of the solution A) II and III only B) I, II, and IV only C) I, II, and III only D) I and III only E) You need all of the information.
Answers
According to molar concentration, for calculating molarity of salt solution mass,molar mass of salt and volume of solution is required , hence option B is correct.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Learn more about molar concentration,here:
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Explanation:
to find molarity
1the mass of salt added
Find the number of moles of solute dissolved in solution,
2 molar mass of salt
Find the volume of solution in liters,
4 total volume of solution
so B
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Answers
CO₂ produced : 11.92 moles
Further explanation
Reaction
2C₂H₆ (g)+7O₂ (g) ⇒4CO₂ (g)+6H₂O(g)
mol ratio C₂H₆ : CO₂ = 2 : 4
moles of CO₂ :
Answers
Moles = 0.5 mol
Solution:
Moles is related to mass as follow,
Moles = Mass / M.mass ----- (1)
Where;
Mass = 50 g
M.mass = Ca (40) + C (12) + O₃ (16)₃ = 100 g/mol
Putting values in equation 1,
Moles = 50 g ÷ 100 g.mol⁻¹
Moles = 0.5 mol
Answers
Answer:
C₆H₆
Explanation:
Each border of the figure represents 1 atom of carbon. We have 6 borders = 6 atoms of carbon.
Each atom of carbon form 4 bonds. All the carbons are doing a double bond and a single bond with other carbons. That means are bonded 3 times. The other bond (That is not represented in the figure. See the image) comes from hydrogens. As we have 6 carbons that are bonded each 1 with one hydrogen. There are six hydrogens and the molecular formula is:
C₆H₆
This structure is: Benzene
Answers
B. When infectious agents get into the human body, the body gets a surge of energy, causing a slight increase in body temperature, and you feel great.
C. When infectious agents get into the human body, your body responds by raising the core body temperature, causing a fever.
D.Nothing happens when the human body is exposed to an infectious agent.
Answers
Answer:
when infectious agents get into the human body your body responds by raising the core body temperature causing a fever
The answer is C it will raise your body temp and cause a fever
Answers
Answer:
A
Explanation:
Halogens have 7 electrons in their valence shell and requires just one electron to achieve their stable structure. Because of this they have high electron affinity and hence high electronegativity and they are strong oxidizing agents. Oxidation is the loss of electrons . Halogens have a high readiness to take electrons which a metal loses thereby oxidizing it. The other options are wrong as they involve compounds and not the elemental form as stated in the question.