Answer:
there are 1.4201927800478769 moles in 83 particles of sodium chloride. or 1.42 for short.
Explanation:
Balance the following equations:
C3H8 (g) + O2 (g) → CO2 (g) + H2O (g)
NH3 (g) O2 (g) NO2 (g) H2O (g)
Al(NO3) Na3S Al2S3 NaNO3
Explanation:
C3H8 + 502 ----> 3CO2 + 4H20
4NH3+7O2------> 4NO2+6H2O
2Al(NO3)3 + 3Na2S -------> Al2S3+6NaNO3
True or false, rewrite it to make it true.
To balance a chemical equation, only the subscripts of a reactant and product can be changes
Answer:
false
Explanation:
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
(giving brainiest) solve please! dont copy I've looked up everything ill know if you copied something!
Answer:
Precipitation falls in liquid and solid
Evaporation changes liquid water to gas
Explanation:
Precipitation exists in snow, rain, sleet, many forms liquid or solid but NOT gas.
Evaporation is from a liquid to a gas change, also called vaporization.
arrow futhermost to left is evaporation (rising into air)
arrow futhermost to right is precipitation ( falling back to ground)
hope this helped xxx please mark brainliest
Please please help me
Answer:
I agree with Omar because it depends on what the charge of the object and magnet is. If the magnet is negative and the object is positive, they will pull together. If the magnet is negative and the object is negative then they will pull apart.
Explanation:
how many moles are 20 grams of Helium ?
Answer: The correct answer is 5.00 moles
Explanation:
Which affects both deep water and surface currents in the ocean? the wind the temperature of the water the Coriolis effect None of the above
Answer:
the wind and the temperature of water both drive ocean currents
Answer:
B. Write 'T' for true or 'F' for false statements :
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3. Text box icon is found in Styles group.
4. Publisher does not allow you to add images to your document.
5. Margin guides are blue lines that mark the edges.
To determine the concentration of a sodium thiosulfate solution as in this experiment, a student pipetted 25.0 mL of 0.0100 M potassium iodate (KIO3) solution into a 125 mL Erlernmeyer flask. Potassium iodide and sulfuric acid were added as in this experiment. The titration needed 15.21 mL of the sodium thiosulfate to reach the end point. What is the concentration of the sodium thiosulfate solution
Answer:
0.0986M is the concentration of the Na₂S₂O₃ solution
Explanation:
Potassium iodate, KIO₃, reacts with sodium thiosulfate, Na₂S₂O₃, as follows:
KIO₃ + 6Na₂S₂O₃ +5KI + 3H₂SO₄ → 3H₂O + 3K₂SO₄ + 3Na₂S₄O₆ + 6NaI
To solve this question we must find the moles of sodium thiosulfate that reacts as follows:
Moles KIO₃:
0.0250L * (0.0100mol / L) = 2.5x10⁻⁴moles KIO₃
Moles Na₂S₂O₃:
2.5x10⁻⁴moles KIO₃ * (6mol Na₂S₂O₃ / 1mol KIO₃) = 1.5x10⁻³ moles Na₂S₂O₃
Molar concentration:
1.5x10⁻³ moles Na₂S₂O₃ / 0.01521L =
0.0986M is the concentration of the Na₂S₂O₃ solutionWhat is the percent yield of LiCl if I produced 30.85g LiCl and my theoretical yield was calculated to be 35.40g LiCl?
Answer:
87.15%
Explanation:
To find percent yield, we can use this simple equation
[tex]\frac{Actual}{Theoretical} *100[/tex]
Where "Actual" is the amount in grams actually collected from the reaction, and "Theoretical" is, well, the theoretical amount that should have been produced.
They give us these values, so to find the percent yield, just plug the numbers in.
[tex]\frac{30.85}{35.40} *100\\\\ =87.15[/tex]
So, the percent yield is 87.15%
An easy trick to remember how to do this is just to divide the smaller number by the bigger number and move the decimal back two places. If you have a percent yield greater than 100%, something is wrong in the reaction.
Consider the Fischer ester synthesis of methyl benzoate from benzoic acid and methanol in the presence of sulfuric acid as a catalyst. A reaction was performed in which 3.8 g of benzoic acid was reacted with excess methanol to make 2.0 g of methyl benzoate. Calculate the theoretical yield and percent yield for this reaction.
Answer:
48.8%
Explanation:
The reaction has a 1:1 mole ratio so;
Number of moles of benzoic acid reacted = mass/molar mass = 3.8 g/122.12 g/mol = 0.03 moles
So;
0.03 moles of methyl benzoate is formed in the reaction
Mass of methyl benzoate formed = 0.03 moles * 136.15 g/mol = 4.1 g
percent yield = actual yield/theoretical yield * 100/1
percent yield = 2.0 g/4.1 g * 100 = 48.8%
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]
Learn more:
brainly.com/question/12161663
Part A
Choose the paramagnetic species from below.
O He
O Te
O T14+
O All of the above are paramagnetic.
None of the above is paramagnetic.
Answer:
o He
Explanation:
basyshsiz0qnshshhsjzz
How many moles of Ag can be obtained from 2.77 moles Cu using the following
balanced reaction?
2AgNO3
+ Cu
Cu(NO3)2
+ 2Ag
Answer:
2.77×2= 5.4 mol Ag can be obtained
KBr is the formula for an ionic compound. The fact that neither symbol is followed by a subscript means that there is a(an) of ions in the compound
Answer:
equal number of ions
Explanation:
They cancel each other out that's why there is none
Photosynthesis in a plant is an example of which characteristic of living things?
1. Reproduction
2. Response to the environment
3. Growth and development
4. Ability to obtain and use energy
Answer:
4. Ability to obtain and use energyWhich of the following compounds is the most stable?
Answer:
Hey mate......
Explanation:
This is ur answer......
fluoridesThus, fluorides are the most stable while iodides are the least stable.
Hope it helps!
Mark me brainliest pls.....
Follow me! :)
Answer:
LICI
Explanation:
a p e x :)
What part of the food. chain is a pine?
a:primary consumer
b:secondary consumer
c:herbivore
d:producer
Answer:
producer
Explanation:
What is the molarity of ZnCl, that forms when 20.0 g of zinc completely reacts with CuCl2, according to the following reaction? Assume a final
volume of 285 mL
Zn(s) + CuCl2(aq) → ZnCl2(aq) + Cu(s)
A student pours 800.0 mL of a 3.000 molar solution of sodium hydroxide into a 2.00 liter volumetric flask and fills the flask up with water. What is the new molarity of the solution?
A) 12.00 M
B) 1.20 M
C) 14.00 M
D) 0.0750 M
The distance that is covered by the wave in one second is called
Answer:
The distance that is covered by the wave in one second is called frequency.
Explanation:
Match each object to its definition.
A. meteorite
B. meteoroid
C. meteor
->
1. The remains of a rock from space that strikes Earth’s surface
2. A rock that burns up in Earth’s atmosphere
3. A small piece of rock in space
Answer:
definition 1. goes with B. meteoroid
definition 2. goes with C. meteor
definition 3. goes with A. meteorite
Answer: meteoroid - a small piece of rock in space, meteor - a rock that burns up in Earths atmosphere, meteorite - The remains of a rock from space that strike Earth's surface.
Explanation:
does anyone know the answer to this
igneous sedimentary, and metamorphic rocks are found at the same cliff side.Which statement is correct?
Answer:
The metamorphic rock and sedimentary rock were already at this location and magma flowed into other rocks
Explanation:
HELP!
The law of conservation of energy states:
A. Energy increases exponentially with times
B. Total energy decreases due to energy output.
C. Energy cannot be created or destroyed.
D. Energy always remains in the same form.
Answer:
C
Explanation:
energy cannot be created or destroyed like solar energy for instance. it is already energy because it comes from the sun and for other reason.
Hope this helps!
Explain why water and syrup are able to mix?
what is the name of this structure here please and thanks
Answer:
look at the file that the other person sent
What is the name of PbS2
Answer:
Lead sulfide.
Explanation:
It’s worth 50 points! Please help!
Answer:
1) NO2
2) 49.4%
Explanation: