1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ksenya-84 [330]
3 years ago
12

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 18.0 g of luminol to H2O creating

a solution with a total volume of 75.0 mL. What is the molarity of the stock solution of luminol?Before investigating the scene, the technician must dilute the luminol solution to a concentration of 5.00×10^-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces.How many moles of luminol are present in 2.00 L of the diluted spray?What volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B)?
Chemistry
1 answer:
Bond [772]3 years ago
6 0

Answer:

Part A. 1.355 mol/L

Part B. 0.100 mol

Part C. 74.0 mL

Explanation:

Part A.

The molar mass of luminol is 177.16 g/mol, so the number of moles at 18.0 g is:

n = mass/molar mass

n = 18.0/177.16

n = 0.1016 mol

The molarity is the number of moles divided by the volume (0.075 L)

C = 0.1016/0.075

C = 1.355 mol/L

Part B.

The number of moles is the molarity multiplied by the volume, so:

n = 5.00x10⁻² mol/L * 2.00 L

n = 0.100 mol

Part C.

To prepare a solution by dilution, we can use the equation

C1V1 = C2V2

Where C1 is the concentration of the initial (stock) solution, V1 is its volume necessary, C2 is the concentration of the diluted solution, and V2 is its volume.

Thus, C1 = 1.355 M, C2 = 0.05 M, V2 = 2.00 L

1.355V1 = 0.05*2

V1 = 0.074 L

V1 = 74.0 mL

You might be interested in
15 points will mark brainliest
AfilCa [17]
Part B question 1 Answer: C
that’s the on that makes most sense
6 0
3 years ago
Read 2 more answers
Classify each of the statements below as pertaining to viscosity or osmolarity.
Yuliya22 [10]
Viscosity is related to the parallel shear force acted by the fluid. In lay man's term, viscosity is the ease of how the fluid flows. The faster the flow is, the lower the viscosity (and vice versa). On the other hand, osmolarity pertains to the concentration of a component in a mixture expressed in number of solute particles per liter of the mixture.
7 0
3 years ago
Which of the following statements about C3 carbon fixation is true? a. C3 carbon fixation is an adaptation for plants exposed to
saul85 [17]

Answer: The answer is B

Explanation:

RiP BoZo. shout out to faze gabi staright up bopped potato girl.

8 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP!!!!!!!!
MaRussiya [10]

Answer:

You need to count all the atoms on each side of the chemical equation. once you know how many of each type of atom you have,you can only change the coefficient. (the numbers in front of the atoms or compounds

7 0
2 years ago
What is the molecular shape of BF3?
Troyanec [42]
Trigonal planar. Hope that helps!
3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the most effective way to maintain good indoor air quality?
    14·1 answer
  • In a sample of liquid water (H2O), which property differs among the water molecules?
    13·1 answer
  • What is the molar mass of (NH), CO?<br> 138g<br> 788<br> 968<br> 1448
    8·1 answer
  • 7) Convert 8.34 x 10^-6 Kg to cg"
    8·1 answer
  • Each element has a unique number of _____
    10·2 answers
  • 2. Explain why sedimentary rock layers of the North and South Rim(side) of the Grand Canyon are the same age, using Steno’s Prin
    9·1 answer
  • A light year is a measure of<br> O length<br> O speed<br> O time<br> O volume
    13·1 answer
  • What is the amount of heat required to complete MELT a 200 gram sample of H2O(s)
    8·2 answers
  • CHEMCIAL TECHNOLOGY QUICK CHECK which activity would be considered resource extraction? eating beef raising cattle eating deer h
    13·1 answer
  • What is the volume of 0.80 grams of o2 gas at stp? (5 points) group of answer choices 0.59 liters 0.56 liters 0.50 liters 0.47 l
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!