Solution :
Given :
The spectrophotometer reading is (A) = 0.18
Absorbdance Vs Concentration follows a straight line relation passing throght the origin.
Let the relation be of the form A = mC -------(1)
where, A = absorbdance
C = concentration (μg/L)
For a given point, A = 0.9
C = 3 μg/L
From equation (1), we have
0.9 = m x 3
m = 0.3
Therefore the complete equation of the spectrophometer calibration curve becomes A = 0.3C
Now we have the relation relating the concenrtation of the traces and the absorbdance. Let us now calculate the concentration of the traces in sample for which A = 0.18.
[tex]$C = \frac{0.18}{0.3}$[/tex]
= 0.6
Traces concentration = 0.6 μg/L
Now in order to calculate the volume of the blood in a grown man we must know how much dye(mass) was injected into his blood.
For that it is given that the trace solution of 0.6 [tex]$cm^3$[/tex] and 5 μg/L was injected.
∴ Mass of the dye in solution injected [tex]$=\frac{5 \times 10^{-3} \times 10^6 \ \mu g\times 0.6 \ cm^3}{10^3 \ cm^3}$[/tex]
= 3 μg
This much of mass is diluted throughout the blood volume.
Thus if V(L) is total blood volume, then 0.6 μg/L x V = 3 μg
This means that the total mass of dye in the body is what we injected initially i.e. 3 μg and must be holding by V(L) of blood.
∴ [tex]$V=\frac{3\ \mu g}{0.6 \ \mu g/L}$[/tex]
= 5 L
Draw the organic product(s) formed when CH3CH2CH2OH is treated with each reagent. a. H2SO4 e. SOCl2, pyridine i. [1] TsCl, pyridine; [2] NaSH b. NaH f. PBr3 j. POCl3, pyridine c. HCl ZnCl2 g. TsCl, pyridine d. HBr h. [1] NaH; [2] CH3CH2Br
Answer:
See answer below
Explanation:
In this case, we are treating an alcohol with different reagents to give different products. In the picture below you have the draw of each product, and here, the explanation.
a) H₂SO₄: In this case, it will promote an E1 reaction forming an alkene as product.
b) NaH: In this case, it will promote an acid base reaction, and the final product will be an alcoxide.
c) HCl/ZnCl₂: In this case, primary alcohols reacts with this reactive to form an alkyl halide.
d) HBr: Another reaction forming an alkyl halide with bromine in this case.
e) SOCl₂: Similar to c), it will form an alkyl chloride.
f) PBr₃: Similar to d, forming an alkyl bromide.
g) TsCl: Here it will be a sustitution reaction, where tosilate replaces the OH
h) NaH/CH₃CH₂Br: In this case it will form an alcoxide and then, a larger alkyl.
i) TsCl/NaSH: First it will form a tosilate and then, the SH group. A sustitution reaction.
j) POCl₃: A sustitution reaction forming an alkyl chloride.
See picture below for drawings.
Hope this helps
Where and how does respiration take place
Answer:
Glucose and oxygen react together in cells to produce carbon dioxide and water and releases energy. The reaction is called aerobic respiration because oxygen from the air is needed for it to work. Energy is released in the reaction. The mitochondria , found in the cell cytoplasm, are where most respiration happens.
Please HELP!!! Automotive airbags inflate when sodium azide decomposes explosively to its constituent elements. How many grams of sodium azide are required to produce 24.4 L of nitrogen gas at standard temperature and pressure? 2NaN3 --> 2Na + 3N2
47.2 g of sodium azide
106.2 g of sodium azide
1.63 g of sodium azide
0.726 g of sodium azide
Answer: 47.2 g of sodium azide
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles of nitrogen}=\frac{\text{Given volume}}{\text {Molar volume}}=\frac{24.4L}{22.4L}=1.09moles[/tex]
The balanced chemical reaction is:
[tex]2NaN_3\rightarrow 2Na+3N_2[/tex]
According to stoichiometry :
3 moles of [tex]N_2[/tex] are produced by = 2 moles of [tex]NaN_3[/tex]
Thus 1.09 moles of [tex]N_2[/tex] are produced by =[tex]\frac{2}{3}\times 1.09=0.73moles[/tex] of [tex]NaN_3[/tex]
Mass of [tex]NaN_3=moles\times {\text {Molar mass}}=0.73moles\times 65g/mol=47.2g[/tex]
Thus 47.2 g of sodium azide are required to produce 24.4 L of nitrogen gas at standard temperature and pressure
Sugar
O2
CO2
H2O
What is the name of this energy pathway?
thnxx for free point? ?????????
HELPPP!!!!!!!!
On the illustration above , you have a diagram of paper chromatography . The ink spots are represented at the bottom of the paper and the separated dyes are at different distances towards the top of the paper Why do the components of the dyes move to different heights?
Answer:
The components move towards different height because of their density as the water is being absorbed by the paper the water would take the components which has lower density up and would let the lower density component to remain in its place
Hope it helps
Can a chemical reaction be both exothermic and endothermic? Explain.
Explanation:
reaction cannot be both endothermic and exothermic at the same time.
Which set of molecule representations correctly match.
Answer:
D
Explanation:
THERE ARE 3 HYDROGEN ATOMS AND 1 NITROGEN SUPPORTING THE FORMULA OF AMMONIA NH3 AND TOTAL ATOMS IS ALSO 4.
g You have decided to add ethidium bromide directly to your agarose solution before you pour you gel. You have a stock solution of 6 mg/ml and you want a final concentration of 0.5 g/ml in your 50 ml agarose solution. Calculate how much of the stock solution you will need to make add to the agarose solution to give you a final concentration of 0.5 g/ml.
Answer:
4.17mL of the stock solution of ethidium bromide must be added in the 50mL agarose solution
Explanation:
You want to dilute the ethidium bromide from 6mg/mL to 0.5mg/mL, that is:
6mg/mL / 0.5mg/mL = 12 times the stock solution must be diluted.
As the final volume of the solution is 50mL, you must add:
50mL / 12 =
4.17mL of the stock solution of ethidium bromide must be added in the 50mL agarose solution
is this right someone please help asap photo attached above
The number of moles in 75.0 liters of F2 at STP
you have a sample of 23.8 g of C2H6. how many moles of C2H6 are in the sample?
Be sure to show your work and each step is writing out clearly.
Answer:
0.791 moles are present in the sample
Explanation:
To convert mass to moles of a substance you must find the molar mass of the susbtance.
The molar mass of C₂H₆ is:
2C = 12.01g/mol*2 = 24.02g/mol
6H = 1.01g/mol*6 = 6.06g/mol
Molar mass = 24.02g/mol + 6.06g/mol = 30.08g/mol is the molar mass of C₂H₆
And the moles of 23.8g of this substance are:
23.8g * (1mol / 30.08g) =
0.791 moles are present in the sampleWhat are the characteristics of a gas?
A. no definite shape but a definite volume
B. a definite shape but no definite volume
C. a definite volume and definite shape
D. no definite shape or definite volume
Answer:
D. no definite shape or. definite volume
Explanation:
Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. The particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.
Based upon the percent yield you calculated, what is one source of error, and the resulting of that error in your experiment.
Select the option corresponding to the following choices
a. When decanting, some solid was lost, resulting in less copper recovered and a lower % yield
b. When decanting, some solid was lost, resulting in more copper recovered and a higher % yield
c. When drying over the steam bath, did not let the sample dry completely, resulting in a higher mass of copper recovered, and a higher % yield.
d. When drying over the steam bath, did not let the sample dry completely, resulting in a lower mass of copper recovered, and a lower % yield.
Answer:
The answer is "Choice a".
Explanation:
In the given question, through the basis of their determined percentage yield, a smaller copper increase in value and less copper has been lost during decanting, but now this mistake in your experiment was the cause of confusion, and the wrong choice can be defined as follows:
In point b, it is wrong because A few other solids were not lost during decanting, resulting in a higher recovery of copper as well as a boost in the percentage yieldIn point c, it is wrong because whenever the vapor bath was dried, the specimen did run dry totally, which did result in such a heavier density of copper and a larger percentage of the yield.In point d, it is wrong because whenever the vapor bath was dried, the sample was fully dried, which also resulted in much less adhesive weight and a much less percentage of the yield.Calculate acetic acid needed to make a 35 mM solution in 1 L.
Note: 35 mM = 0.035 M = 0.035 mol/L.
1. Calculate how many moles you need for 1L.
2. Calculate how many grams of acetic acid that is.
3. Use the density of the glacial acetic acid, 1.05 g/mL, to calculate how many mL you
will need to use. Show your instructor or TA this calculation in your notebook to make
sure you have the correct answer before going forward.
Answer:
1. 0.035 mole
2. 2.1 g
3. 2 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of acetic acid = 0.035 mol/L.
1. Determination of the number of mole of acetic acid needed.
Molarity of acetic acid = 0.035 mol/L.
Volume of solution = 1 L
Mole of acetic acid =?
Molarity = mole /Volume
0.035 = mole / 1
Mole of acetic acid = 0.035 mole
2. Determination of the mass of acetic acid, CH₃COOH.
Mole of CH₃COOH = 0.035 mole
Molar mass of CH₃COOH = 12 + (3×1) + 12 + 16 + 16 + 1
= 12 + 3 + 12 + 16 + 16 + 1
= 60 g/mol
Mass of CH₃COOH =?
Mole = mass / Molar mass
0.035 = Mass of CH₃COOH / 60
Cross multiply
Mass of CH₃COOH = 0.035 × 60
Mass of CH₃COOH = 2.1 g
3. Determination of the volume.
Mass = 2.1 g
Density = 1.05 g/mL
Volume =?
Density = mass / volume
1.05 = 2.1 / volume
Cross multiply
1.05 × volume = 2.1
Divide both side by 1.05
Volume = 2.1 / 1.05
Volume = 2 mL
PLEASE HURRY IM TIMED Which of the following are examples of physical changes? (Select all that apply.)
tearing a piece of paper
a nail rusting
crushing a soda can
Answer:
Explanation:
tearing a piece of paper
crushing a soda can
what is the formula for the polyatomic ion and name the following compound
Sn(NO2)2
The chemical formula for the polyatomic ion is NO₂⁻ and name of the following compound is tin (II) nitrite.
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
Learn more about chemical formula,here:
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How many moles of H2 would be formed from 2.26 mol of HCI?
Mg + _HCI → _MgCl2 + H2
Answer:
2.6 moles of HCl will produce moles of H2 = [tex]1.3[/tex]
Explanation:
Mass of HCl is 36.458 g/mol
Mass of Hydrogen is 1.00794 g/mol
The balanced equation here is
Mg + 2_HCI → _MgCl2 + H2'
2 moles of HCl produces one mole of H2
One mole of HCl will produce moles of H2 = [tex]\frac{1}{2}[/tex]
2.6 moles of HCl will produce moles of H2 = [tex]\frac{1}{2} * 2.6 = 1.3[/tex]
A spider has several eyes.
What is the main function of these organs?
I’ll give y’all 100 points
Answer:
it is d
Explanation:
Answer: d
Explanation: i think that answer
How many formula units of CaO are in 32.7 g of CaO?
A) 0.58 formula units
B) 1.96 x 1025 formula units
C) 56.08 formula units
D) 3.51 x 1023 formula units
Answer:
D) 3.51x10²³ formula units
Explanation:
To know this, we need to calculate the molecular mass of CaO. To do that, let's use the atomic mass of each element of this compound.
Ca: 40.08 g/mol; O: 16 g/mol
With these given AM, let's calculate the molar mass of CaO:
Mm CaO = 40.08 + 16 = 56.08 g/mol
Now that we have the MM of CaO, it's time to determine the moles of CaO:
moles = mass / MM
moles = 32.7 / 56.08 = 0.5831 moles
Finally to get the formula units, we need to use the Avogadro's number which is 6.02x10²³. According to this number, 1 mole of any substance has this number of atoms, molecules or formula units. So, if we have 0.5831 moles, then the formula units will be:
FU = 0.5831 * 6.02x10²³
FU = 3.51x10²³ formula unitsHope this helps
Use the following equation:
2 CO (g) + O2 (g) = 2 CO2 (g)
How many moles of CO and O2 are required to produce 10 moles of CO2?
A) 10 moles of CO and 5 moles O2
B) 5 moles of CO and 10 moles of O2
C) 2 moles of CO and 1 mole O2
D) 2 moles of CO and 2 moles CO2
Answer:
A) 10 moles of CO and 5 moles O2
How many grams will be needed to make a 1.00 Liter solution of 0.500M
sodium chloride?
Mass of NaCl = 29.25 g
Further explanationGiven
A 1.00 Liter solution of 0.500 M Sodium chloride
Required
Mass of NaCl
Solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Input the value :
n = M x V
n = 0.5 x 1
n = 0.5 mol
Mass NaCl :
= mol x MW
= 0.5 x 58.5
= 29.25 g
What are three forms of the element carbon?
Answer:
There are at least eight forms of carbon: amorphous, graphite, diamond, fullerenes, aggregated diamond nanorods, carbon nanofoam, glassy carbon, and linear acetylenic carbon.
Explanation:
How many atoms are in 2.5mol of sodium
Answer:
1024 sodium atoms.
How much volume would a sample of galena have it its mass was 300 grams?
Answer:
8272uegdgd9w0wpwlw0w-w[w9w8177w7w7
name two objects which are hard to touch
Answer:
Name of two hard objects is Brick and Wood.
fire and mercury
i think i am not sure
but pls brainlist
A rock climbing group reached the top of Mount Everest in the Himalayan mountains. Mount Everest is about 29,000 feet above sea level and formed by the interaction of two tectonic plates. The group leader was surprised to find fossilized marine organisms on top of the mountain. Which of the following describes the geologic history of Mount Everest?
answer choices:
A: Two tectonic plates had different densities which caused the denser plate containing fossilized marine organisms to rise above the surface and form the Himalayan mountains.
B: Two tectonic plates had different densities which caused one plate to subduct into the ocean and the other one to rise causing marine organisms to fossilize on top of Mount Everest.
C: Two tectonic plates had the same density which caused one plate to subduct into a transform boundary that fossilized marine organisms before the Himalayan mountains were formed and uplifted.
D: Two tectonic plates had the same density and a collision of the plates pushed the advancing plate that contained fossilized marine organisms upward forming the Himalayan mountains and Mount Everest.
Answer:
Two tectonic plates had the same density and a collision of the plates pushed the advancing plate that contained fossilized marine organisms upward forming the Himalayan mountains and Mount Everest.
In an ecosystem comprising of the Himalayan region,following describes the geologic history of Mount Everest that two tectonic plates had the same density and a collision of the plates pushed the advancing plate that contained fossilized marine organisms upward forming the Himalayan mountains and Mount Everest.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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Determine the number of protons, neutrons, and electrons:
Answer:
Hey Mia! This is what I put for my answer.
Explanation:
I hope this helps and have a good day :)
The planets in the solar system revolve around the sun because the sun is
Answer:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
The vapor pressure of liquid hexane, C_6 H_14, is 40.0 mm Hg at 271 K. A sample of C_6 H_14 is placed in a closed, evacuated container of constant volume at a temperature of 400 K. It is found that all of the C_6 H_14 is in the vapor phase and that the pressure is 74.0 mm Hg. If the temperature in the container is reduced to 271 K, which of the following statements are correct? Choose all that apply. a) Liquid hexane will be present. b) Some of the vapor initially present will condense. c) Only hexane vapor will be present. d) No condensation will occur. e) The pressure in the container will be 50.1 mm Hg.
Answer:
Only Options (c), (d) and (e) are correct.
Explanation:
Without mincing words let's dive straight into the solution to the question above.
The following parameters from the question are given below which are going to aid in solving this question.
=> The vapor pressure of liquid hexane = 40.0 mmHg, Temperature, T1 = 271K.
=> The temperature, T2 = 400 K, the pressure,P2 = 74.0 mm Hg. The reduced temperature,T3 in the container = 271 K.
What is needed now is to Determine the final temperature, T3 = 271/400 × 74 = 50.01 mmHg.
Therefore, we only have the presence of the vapour of Hexane and there is no condensation. Hence, option c, d and e are the only correct options.
Which of the following is a human activity that can cause climate change?
A) burning fossil fuels
B) removing greenhouse gases
C) using alternative energy sources
D) increasing particulates from volcanoes
Answer:
D) increasing particulates from volcanoes
Explanation:
Answer:
A) burning fossil fuels
Explanation:
B would help or slow down climate change, C would as well and D is something natural and not human-caused.
good luck, i hope this helps :)