Answer:
Molar mass = (24.31 + 2 × 35.45) = 95.21 g mol–1 i.e. 95.21 g of MgCl2 is exactly 1 mole.
Explanation:
How many moles of caffeine are in 130 mg of caffeine coffee?
Answer:
0.00067mols
Explanation:
firs convert 130mg to grams which is 0.13g, then find the molar mass of caffeine which is 194.19g/mol.
0.13g/194.19gmol=0.0067mols
2nd attempt
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Calculate AEfor a system that absorbs 599,0 kJ of heat from its surroundings
and does 3510 kJ of work on its surroundings.
Answer:
-2911 kJ
Explanation:
Step 1: Given data
Heat absorbed by the system (Q): 599.0 kJ (By convention, when the systems absorbs heat, Q > 0)Work done by the system on the surroundings (W): -3510 kJ (By convention, when the systems does work on the surroundings, W < 0)Step 2: Calculate the change in the internal energy (ΔE)
We will use the following expression.
ΔE = Q + W
ΔE = 599.0 kJ + (-3510 kJ) = -2911 kJ
Difference between sublimate and distillate
Answer:
distillate is the liquid that has been condensed from vapour during distillation; normally a purified form or a fraction of an original liquid while sublimate is (chemistry) a product obtained by sublimation
How many molecules of CO2 at standard temperature and pressure in 5.4 moles of CO2
Answer:
3.25×10²⁴ molecules.
Explanation:
From the question given above, the following data were obtained:
Number of mole of CO₂ = 5.4 moles
Number of molecules of CO₂ =?
The number of molecules of CO₂ in 5.4 moles can be obtained as follow:
From Avogadro's hypothesis,
1 mole of CO₂ = 6.02×10²³ molecules
Therefore,
5.4 moles of CO₂ = 5.4 × 6.02×10²³
5.4 moles of CO₂ = 3.25×10²⁴ molecules
Thus, 5.4 moles of CO₂ contains 3.25×10²⁴ molecules.
NEED A AWNSER ASAP PLEASE!!!!
Answer:
2. the second one is the answer
Because it shows both potential and kinetic energy
Listed below are characteristics that serve as evidence of shared ancestry between fish and reptiles. Select the option that applies only to embryos rather than adults (1 point)
Ogill slits that turn into gills
O hatch from and lay eggs
O scales as a form of skin
Ospines and tails
Answer:
Its option A
Explanation:
It cant be option B because the adults lay the eggs, option A is correct because they embryos gill slits turn into gills.
Methane reacts with chlorine to produce methyl chloride and hydrogen chloride. Once formed, the methyl chloride may undergo further chlorination to form methylene chloride (CH2Cl2), chloroform, and carbon tetrachloride. A methyl chloride production process consists of a reactor, a condenser, a distillation column, and an absorption column. A gas stream containing 80.0 mole% methane and the balance chlorine is fed to the reactor. In the reactor a single-pass chlorine conversion of essentially 100% is attained, the mole ratio of methyl chloride to methylene chloride in the product is 5:1, and negligible amounts of chloroform and carbon tetrachloride are formed. The product stream flows to the condenser. Two streams emerge from the condenser: the liquid condensate, which contains essentially all of the methyl chloride and methylene chloride in the reactor effluent, and a gas containing the methane and hydrogen chloride. The condensate goes to the distillation column in which the two component species are separated. The gas leaving the condenser flows to the absorption column where it contacts an aqueous solution. The solution absorbs essentially all of the HCl and none of the CH4CH4 in the feed. The liquid leaving the absorber is pumped elsewhere in the plant for further processing, and the methane is recycled to join the fresh feed to the process (a mixture of methane and chlorine). The combined stream is the feed to the reactor.
Required:
a. Choose a quantity of the reactor feed as a basis of calculation, draw and label a flowchart, and determine the degrees of freedom for the overall process and each single unit and stream mixing point. Then write in order the equations you would use to calculate the molar flow rate and molar composition of the fresh feed, the rate at which HCl must be removed in the absorber, the methyl chloride production rate, and the molar flow rate of the recycle stream. Do no calculations.
b. Calculate the quantities specified in Part (a), either manually or with an equation-solving program.
c. What molar flow rates and compositions of the fresh feed and the recycle stream are required to achieve a methyl chloride production rate of 1000 kg/h?
3
1 point
The formula for acetic acid is HC H302
What is the percent composition of carbon in acetic acid?
molar mass of the element you need to find a percentage of
molar mass of the entire substance
40.0%
20.0%
33.3
41.4%
Previous
The table shows the rate of reaction for two unknown time intervals during a chemical change.
Reaction Rates
Time Intervals (s) Rate (M/s)
T1 1.8 x 10−6
T2 1.0 x 10−6
Which of the following is true for the two time intervals? (5 points)
Select one:
a. T1 is longer than T2, and the concentration of reactants at the end of T1 is lower than that of T2.
b. T1 is longer than T2, and the concentration of products at the end of T1 is lower than that of T2.
c. T1 is shorter than T2, and the concentration of reactants at the end of T1 is higher than that of T2.
d. T1 is shorter than T2, and the concentration of products at the end T1 is higher than that of T2.
Answer:
i think a is the right answer
Combustion Analysis of an unknown hydrocarbon resulted in the capture of 216.00 g of water vapor and 440.00 g of CO2. The total mass of the hydrocarbon before combustion was 144 g.
(1. How many moles of carbon dioxide are present after combustion?)
(2. What is the empirical formula for the unknown hydrocarbon?)
(3. How many water molecules does the water vapor trap capture?)
(4. The gram-formula mass for the unknown hydrocarbon was determined to be 72 g/mol. How many moles of the unknown hydrocarbon were present in the original sample?)
(5. infrared spectral analysis determines that the unknown hydrocarbon does NOT contain oxygen. How many moles of O2 are used in combusting the unknown sample?)
1: 10 mol CO2
2: C10H24
3: 12 mol H2O
4: 0.5 mol
5: 16 mol O2
The compound is C5H10.
From the information available in the question;
Number of moles of carbon dioxide = 440.00 g/44 g/mol = 10 moles
Number of moles of water vapor = 216.00 g/18 g/mol = 12 moles
Mass of carbon = 10 moles × 12 g/mol = 120 g of carbon
Moles of hydrogen = 12 moles × 2 g/mol = 24 g of hydrogen
Number of moles of carbon = 120 g/12 g/mol = 10 moles
Number of moles of hydrogen = 24 g/1 g/mol =24 moles
Divide through by the lowest number of moles =
C - 10/10 H - 24/10
C - 1 H - 2
The empirical formula is CH2
Molar mass of the compound = 72 g/mol
[12 + 2(1)]n = 72
14n = 72
n = 5
The compound is C5H10.
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If Jonathan went skateboarding from 4:00 PM to 4:30 PM and traveled 450 meters, what was his average speed?
Hiiii :D !! I need help please :>
Answer:
7 false
8 True
9a
:)
Explanation:
A solution is made from 0.5 moles of sodium dichromate. If the volume of the solution is 1 Liter, what is the molarity of the solution
2 M
0.5 M
4 M
1 M
Answer:
4 M
Explanation:
See the steps and explanation in the picture
cell and chromosome characteristics?
Answer:
hope the inserted image will help :)
Explanation:
Answer: Both are centered inside the nucleus.
Explanation: The characteristics between cells and chromosomes are that they both are centered inside the nucleus (which is a cell). This characteristic applies to both plant and animal cells.
Determine the m/v% of a solution where 5 g of sugar is dissolved in enough water to yield 250 mL of total solution
Answer:
2 %m/v
Explanation:
Step 1: Given data
Mass of sugar (solute): 5 gVolume of solution: 250 mLStep 2: Calculate the %m/v of sugar in the solution
We will use the following expression.
%m/v = mass of sugar/volume of solution × 100%
%m/v = 5 g/250 mL × 100% = 2 %m/v
This means that there are 2 grams of sugar every 100 milliliters of solution.
Ok so N2+O2=2NO and my delta h is 180.5 kJ I need to know. If I react 10 g of nitrous gas with excess oxygen how many grams of Nitrogen monoxide will be produced
Answer:
21.6 grams
Explanation:
N₂ + O₂ → 2NOFirst we convert 10 g of N₂ into moles, using its molar mass:
10 g ÷ 28 g/mol = 0.36 mol N₂Then we convert 0.36 moles of N₂ into moles of NO, using the stoichiometric coefficients of the balanced reaction:
0.36 mol N₂ * [tex]\frac{2molNO}{1molN_2}[/tex] = 0.72 mol NOFinally we convert 0.72 NO moles into grams, using its molar mass:
0.72 mol NO * 30 g/mol = 21.6 gPLEASE PLEASE HELP ME!!!A 450 ml gas sample has a pressure of 1.25 atm at 65 °C. What is the temperature, in °C, at which the gas will expand to 865
mL with a pressure of 0.89 atm?
Answer:
89°C
Explanation:
Combined Gas Law (P₁V₁)/T₁ = (P₂V₂)/T₂
(1.25 atm)(450 mL)/(65°C) = (0.89 atm)(865 mL)/T₂
8.653846154 = 769.85/T₂
T₂ = 769.85/8.653846154
T₂ = 88.96044444 = 89°C
3. Which of the following describes the author's purpose in the text? R1.6
A.
to encourage students not to think about money when they're
choosing a degree or career to pursue
B. to stress the importance of viewing college as a way to develop jobs
skills, as well as determine what is important to you
C. to discourage students from pursuing careers in business, as people
are generally dissatisfied with their lives
D. to encourage students to pursue careers that help other people, as
they are usually the most enjoyable and meaningful
Answer:
B
Explanation:
I took the assessment
Help guys
Please
Please help me if u know
Advantages and disadvantages of using tidal energy instead of non-renewable energy sources.
Advantages of using tidal energy:
-Environment-friendly
-A highly predictable energy source
-High energy density
-Operational and maintenance costs are low
-An inexhaustible source of energy
Disadvantages of using tidal energy:
-High tidal power plant construction costs.
-Negative influence on marine life forms.
-Location limits.
-The variable intensity of sea waves.
Which category is our Sun located?
Question 2 options:
White Dwarfs
Supergiants
Giants
Main Sequence
Answer:
main sequence is the correct answer of your question
The sun is located in the main sequence in the solar system of the universe. Option D is correct.
What is a solar system?The solar system is a gravitational bound system that consists of some planets like the moon, earth, Neptune, venus, mars, mercury, Saturn, and Uranus these revolve around on the orbit of space.
The sun is the center of all the planets that is all planets revolve around the sun only as it is the biggest star for all the planets and the majority of the mass of the planet is the sun only.
Therefore, Option D is the correct sun located in the main sequence in the solar system of the universe.
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what is the name of this structure here please and thanks
Answer:
look at the file that the other person sent
A student was directed to convert the mass of a boulder from kg to pounds.
Conversion factor: 1 pound = 454 g
The mass is 22 kg. The student calculated the weight to be 0.048 pounds.
Is this correct? If not, what went wrong?
Answer:
Incorrect
Explanation:
Given that,
The mass of a boulder, m = 22 kg
We need to find the weight of the student in pounds.
We know that,
1 pound = 454 g
or
1 g = (1/454 pounds)
22 kg = 0.022 grams
So,
0.022 grams = [tex]\dfrac{0.022}{454}\ pounds[/tex]
= 0.000048 pounds
The student says the weight is 0.048 pounds. It means he was incorrect.
If H2O is removed from this reaction, what will happen? 2H2 + O2 + 2H20 O A. The product-favored reaction will stop. B. The reactants will react to produce more H2O. C. The equilibrium will not change. D. The reaction will be reactant-favored.
Answer:
B. The reactants will react to produce more H₂O
Explanation:
Given the reaction
2H₂+O₂→2H₂O
A decrease in the amount of H₂O will cause the reaction to produce more H₂O. When you change something, the reaction seeks to undo that change.
Which equation represents neutralization?
(1 ) 6Li(s)+N 2 (g)=>2Li3N(s)(2) 2Mg(s)+O2(g)=>2MgO(s) (3) 2KOH(aq)+H2SO4(aq) =>K 2 SO 4 (aq)+2H 2 O(l)
(4) Pb(NO 3 ) 2 (aq)+K 2 CrO 4 (aq) => 2KNO 3 (aq)+PbCrO 4 (s)
Answer:
3) 2KOH(aq) + H2SO4(aq) ⇒ K2SO4(aq) + 2H2O(l)
Explanation:
KOH is a strong base and a H2SO4 is a strong acid. The two react in a neutralization reaction, producing a salt and water.
Which simple machine is best used to split apart an object
A. A screw
B. A lever
C. A wedge
D. A pulley
Answer:
its A screw :))) your welcome
Help plzz pick on the picture
Please help!
Karl-Anthony is trying to plate gold onto his silver ring. He constructs an electrolyte cell using his ring as one of the electrodes. He runs this cell for 90.6 minutes at 213.8 mA. How many moles of electrons were transferred in this process?
Answer:
0.012 mole of electron
Explanation:
From the question given above, the following data were obtained:
Time (t) = 90.6 minutes
Current (I) = 213.8 mA
Number of mole of electrons =?
Next, we shall convert 90.6 mins to seconds. This can be obtained as follow:
1 min = 60 s
Therefore,
90.6 mins = 90.6 × 60
90.6 mins = 5436 s
Next, we shall convert 213.8 mA to A. This can be obtained as follow:
1000 mA = 1 A
Therefore,
213.8 mA = 213.8 mA × 1 A / 1000 mA
213.8 mA = 0.2138 A
Next, we shall determine the quantity of electricity used in the process. This can be obtained as follow:
Time (t) = 5436 s
Current (I) = 0.2138 A
Quantity of electricity (Q) =?
Q = it
Q = 0.2138 × 5436
Q = 1162.2168 C
Next, the equation for the reaction.
Au⁺ + e —> Au
From the balanced equation above,
1 mole of electron was transferred.
Recall:
1 faraday = 96500 C = 1 e
Thus,
96500 C of electricity is needed to transfer 1 mole of electron.
Finally, we shall determine the number of mole electrons transferred by the application of 1162.2168 C of electricity. This can be obtained as follow:
96500 C of electricity is needed to transfer 1 mole of electron.
Therefore,
1162.2168 C of electricity will transfer = 1162.2168 / 96500 = 0.012 mole of electron
Thus, 0.012 mole of electron was transferred in the process.
Following are the calculation to the moles of electrons that transferred in the process:
Given
Current flows
time[tex]= 90.6\ min = 90.6 \times 60\ sec= 5436 \ sec\\\\[/tex]
For Step 1:
Calculating the Total charge flown in the given time:
For Step 2:
Charge on a single electron
So:
Following are the calculation to the charges of electrons:
Following are the calculation to the electrons transferred:
[tex]=\frac{(726.38\times 10^{19})}{ (6.023 \times 10^{23})}\\\\= 120.60\times 10^{-4}\ moles\\\\[/tex]
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Without these we would not be able to bend our arms or legs. A. Levers B. Bones C.Joints
Answer:
Joints
Explanation:
Without joints we would not be able to bend our arms or legs. Hence option C is correct.
What is bending?Bending is defined as the behavior of a thin structural element under an external load that is applied perpendicular to the element's longitudinal axis. Plants and their parts are thought to bend as a result of a flexure process in which the curvature of the plant part changes. The plant organs' collenchyma gives them flexibility and elasticity, preventing them from breaking when bent.
The force required to bend, straighten, and support joints is applied by muscles to the bones. Muscles act in pairs of flexors and extensors because they may pull on bones but not put them back into place. The extensor muscle relaxes and stretches as the flexor muscle contracts to bend the joint.
Thus, without joints we would not be able to bend our arms or legs. Hence option C is correct.
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Select all of the following statements that are true. Multiple answers are possible
Cells are made of cells
All living things are made of cells
Cells are the smallest living thing.
Only prokaryotic organisms have cells