Answer:
[tex]\Delta H=-92.7kJ[/tex]
Explanation:
Hello there!
In this case, according to the given information, we can infer that 890 kJ of energy are released when 1 mole of methane is burned; however, to find the total heat when 1.67 grams are burned, we first need to calculate the moles in this mass of methane:
[tex]1.67gCH_4*\frac{1molCH_4}{16.04gCH_4}=0.104molCH_4[/tex]
And thus, for calculating the resulting ∆H, we proceed as follows:
[tex]\Delta H=-890kJ/mol*0.104mol\\\\\Delta H=-92.7kJ[/tex]
Regards!
You are given a small beaker of solution at room temperature. You add a bit of solute to the solution and it dissolves. The original solution was
Answer:
Unsaturated
Explanation:
An unsaturated solution contains less solute than it can normally hold at a particular temperature.
This kind of solution can also dissolve more solute.
Hence, when a bit of solute is added to this solution, the solute dissolves indicating that the original solution was unsaturated.
Everything can dissolve in water because water is considered a universal solvent.
Liquid water is cooler than solid salt and sugar, allowing them to dissolve easily.
Salt's ions and sugar's polar bonds are both attracted to the polar water molecules.
Small solutes like salt and sugar can fit in the spaces between large water molecules.
What change would increase the amount of solid solute able to be dissolved in liquid water?
Decreasing rate of stirring
Decreasing surface area
Increasing pressure
Increasing temperature
Answer:
Increasing the temperature
Explanation:
The rate of solubility depends on a few factors. By increasing the temperature, the kinetic energy of the particles increase, leading to a higher rate of diffusion, dissolving the solid solute quicker.
If the half-cell containing 1.00 M Fe(NO3)2(aq) in galvanic cells Y and Z is replaced with a half-cell containing 5.00 M Fe(NO3)2(aq), what will be the effect on the cell voltage of the two galvanic cells
The details of the galvanic cells are missing so i have attached it.
Answer:
The voltage will increase in cell Y and decrease in cell Z.
Explanation:
Looking at the reaction, in half cell 3, we see that reduction takes place in galvanic cell Y while oxidation takes place in galvanic cell Z.
In galvanic cell Y, aluminum gains electrons which is reduction while in galvanic cell Z, Copper loses electrons which is oxidation.
Now, electricity involves movement of electrons and where there is a loss of electrons, it means a decrease in electricity and when there is a gain in electrons, it means there is an increase in electricity.
Now, in electricity, Voltage is directly proportional to electric power.
Thus, the higher the voltage, the higher the electric power.
Thus, in galvanic cell Y that undergoes gain in electrons, there will be an increase in voltage while in galvanic cell Z that undergoes loss of electrons, there will be a decrease in voltage.
If 10.0 grams of sodium phosphate are reacted, what mass of barium nitrate is
required?
Answer: The mass of barium nitrate required is 23.91 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of sodium phosphate = 10.0 g
Molar mass of sodium phosphate = 163.94 g/mol
Plugging values in equation 1:
[tex]\text{Moles of sodium phosphate}=\frac{10.0g}{163.94g/mol}=0.061 mol[/tex]
The chemical equation for the reaction of sodium phosphate and barium nitrate follows:
[tex]3Ba(NO_3)_2+2Na_3PO_4\rightarrow Ba_3(PO_4)_2+6NaNO_3[/tex]
By the stoichiometry of the reaction:
If 2 moles of sodium phosphate reacts with 3 moles of barium nitrate
So, 0.061 moles of sodium phosphate will react with = [tex]\frac{3}{2}\times 0.061=0.0915mol[/tex] of barium nitrate
Molar mass of barium nitrate = 261.337 g/mol
Plugging values in equation 1:
[tex]\text{Mass of barium nitrate}=(0.0915mol\times 261.337g/mol)=23.91g[/tex]
Hence, the mass of barium nitrate required is 23.91 g
How many molecules are in 50 grams of water?
I need D and E please I know the rest
Answer:
K2 +Br ->2KBr
K + I ->KI
actually I don't know the e option but I had tried can u pls balance it urself
Answer:
D. KOH + HBr will give KBr + H2O
E. KOH + HI will give KI + H2O
milk sours because of a chemical reaction that takes place between some of the chemicals that make up the milk. Why does a carton of milk left out on a countertop sour sooner than a carton of milk left in the refidgerator
Answer: A lower temperature slows down the reaction that causes souring, making the milk last longer in the refrigerator.
Explanation:
Milk is made up of different constituents which includes:
--> water,
--> fat,
--> proteins,
--> lactose (milk sugar) and minerals (salts).
Milk is also considered to be a heterogeneous mixture because of the presence of fat and water which are two immiscible liquid phases that are present.
Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as a by-product. It is the lactic acid which makes milk taste sour. Therefore when milk is kept at a LOWER temperature, these bacteria growths are limited but at a HIGHER temperature such as room temperature, the growth is increased. As they increase in growth, the bacteria makes use of the lactose for energy and creates lactic acid as a by-product as earlier mentioned, leading to the sour taste observed.
I Need Help!!!
Let's say one of our bicycles tires has a volume of 30.0 Liters at 300 K. What will happen if
we double the volume?
Answer:
I think that temperature will be cut in half.
When volume increases, pressure decreases. As pressure decreases, temperature decreases. So if you double volume, pressure is halved and so will the temperature. I'm new to this, but I think that's the answer . Tell me if I'm right good luck!
Explain the reason that the atomic emission spectrum of hydrogen contains only four lines.
A)
The hydrogen atoms form a continuous series of quantized energy levels
that transmute at a variety of frequencies.
B)
Hydrogen atoms contain a limited number of quantized energy levels that
emit radiation at a limited number of frequencies.
C)
Many hydrogen atoms accomodate an array of quantized energy levels that
can release energy at a progression of frequencies.
A hydrogen atom consists of a sequence of quantized energy levels that
incorporate radiation only from consecutive frequencies.
D)
Answer:
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation:
thank me later
The reason that the atomic emission spectrum of hydrogen contains only four lines is the hydrogen atoms form a continuous series of quantized energy levels that transmute at a variety of frequencies.
What is atomic emission spectrum of hydrogen?The emission spectrum of hydrogen consist of numerous spectral series, the wavelength is postulated by Rydberg formula.
The reason behind the lines of spectrum is the transition of electron between two energies.
Thus, the correct option is A.
Learn more about atomic emission
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90 grams of NaNO3 were added to solution at 10 degrees Celsius. What type of solution was formed?
Answer:
friend me on here and imma send you the link Explanation:
Im confused someone please help me
Na2S(aq)+Cd(NO3)2(aq) 2NaNO3(aq)+CdS(s)
Sodium sulfide is the limiting reactant. Select the substances that are found in the test tube after the reaction has ended.
A) Na2S
B) Cd(NO3)2
C) NaNO3
D) CdS
En un tanque se halla CO₂ a 285K ocupando un volumen de 8 L. En esas condiciones determinamos el volumen que ocupa a 393K, considerando que la presión se mantiene constante
Answer:
11.0 L
Explanation:
Podemos resolver este problema usando la ley de Charles, que afirma que a presión constante:
T₁V₂=T₂V₁Donde el subíndice 1 indica las condiciones iniciales y el 2 las finales. En este caso:
T₁ = 285 KV₂ = ?T₂ = 393 KV₁ = 8 LIntroducimos los datos:
285 K * V₂ = 393 K * 8 LY calculamos V₂:
V₂ = 11.0 LWhich of the following
are
products of photosynthesis?
1 water
2 carbon dioxide
3 glucose
4 oxygen gas
Multiple choice
Answer:
4. oxygen gas
Explanation:
when a plant goes through photosynthesis, it takes in Carbon Dioxide and releases Oxygen
If 34.9g of water is measured out, how many moles is that?
Answer:
1.94 moles
Explanation:
because moles =mass/mr
=34.9/18
which gives 1.938 so we round it up to 1.94
mr of H2O is 18
hope this helps :)
1.94 moles of water in 34.9 g of water.
Number of moles:It is defined as given mass over molar mass.
Molar mass = 18 g/mol
Number of moles = Given mass / Molar mass
Number of moles = 34.9 g / 18 g/mol
Number of moles = 1.94 moles
Thus, 1.94 moles of water in 34.9 g of water.
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How many Fluorine atoms are needed to accept the electrons of one Ca atom?
1
2
3
4
2 F atoms
Explanation:
A Ca atom has a valence number of +2, which means that when ionized, it will give up two electrons. In turn, a F atom has a valence number of -1, which means it can only accept 1 electron when ionized. So to accommodate the two electrons from Ca atom, we need 2 F atoms.
b) determine the number of moles of carbon dioxide
produced.
Explanation:
The mass of one mole of a substance, expressed in gms, is equal to the mean molecular mass of the substance. The molecular mass of CO2= 12+2x16= 44 so the mass if a mole of CO2 is approximately 44 grams.
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what is the difference between autotrophs and heterotrophs?
Answer:
Autotrophs have the ability to synthesize their own food from the substances surrounding them. Examples of this are photosynthesis or chemical energy. Heterotrophs cannot synthesize their own food. They have to get their nutrition from other animals or plants.
In shorter terms, autotrophs are plants. Heterotrophs are humans.
Explanation:
If 2.18 grams of Br2 react with excess KI, how many grams of KBr are formed? Br2 + 2 K1 - 12 +2 KB
Answer:
2.18 grams of Br2 reacts to produce 3.25 grams of KBr
Explanation:
The balanced equation is
2 KI + Br2 → 2 KBr + I2
2 moles of KI and 1 mole of Br2 reacts to produce two molecules of KBr
Mass of two moles of KI = 2 * 166 grams
Mass of one mole of Br2 = 159.808 grams
Mass of two moles of KBr = 2* 119 grams
Thus, 159.808 grams of Br2 reacts to produce 2* 119 grams of KBr
2.18 grams of Br2 reacts to produce {(2* 119)/ 159.808} * 2.18 grams of KBr
2.18 grams of Br2 reacts to produce 3.25 grams of KBr
In which radiation does the mass number decrease by 4 and proton number of the nuclei decrease to form a new element?
Answer:
Alpha
Alpha decay
When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4.
(06.06 MC)
A gaseous product has a mass of 2.34 g and occupies a volume of 0.854 L. The
temperature in the laboratory is 302 K, and the air pressure is 1.04 atm. Calculate
the molar mass of the gas. (3 points)
1) 22.4 g/mol
2) 44.0 g/mol
3) 65.3 g/mol
4) 86.9 g/mol
The molar mass of the gas is 65.3 g/mol
How to determine the mole of the gas Volume (V) = 0.854 L.Temperature (T) = 302 KPressure (P) = 1.04 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?The number of mole of the gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
Divide both side by RT
n = PV / RT
n = (1.04 × 0.854) / (0.0821 × 302)
n = 0.0358 mole
How to determine the molar mass Mass = 2.34 gNumber of mole = 0.0358 mole Molar mass =?Molar mass = mass / mole
Molar mass = 2.34 / 0.0358
Molar mass of gas = 65.3 g/mol
Learn more about ideal gas equation:
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Answer:
65.3 g/mol
Explanation:
use the ideal gas law with molar mass formula
M = mRT/PV
m= 2.34 g
V = 0.854 L
T = 302k
P = 1.04
R = 0.0821
just plug those in and solve
Select the ion. HCl H 3O +1 H 2O
Answer:
[tex]H _{3}O {}^{ + } [/tex]
Hydroxonium ion
Which human organ turns the food we eat into a liquid mixture?
Large intestine
Liver
Pancreas
Stomach
Answer:
the digestive system
Explanation:
The digestive system is the stomache
it breaks down the food
makes glucine
creates energy
Stomach
Explanation:
When food enters your stomach, it mixes the foods and liquids with digestive juices.
Explain how the particles of air inside the balloon create pressure
Inside the balloon, the gas particles collide with the balloon's inner walls. ... As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.
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A 187.4g sample of C3H5(NO3)3 decomposes to produce carbon dioxide, water, diatomic oxygen, and diatomic nitrogen.
1) Write the balanced chemical equation for the decomposition reaction.
2) How many grams of carbon dioxide are produced?
3) How many grams of water are produced?
4) How many grams of diatomic oxygen are produced?
5) How many grams of diatomic nitrogen are produced?
6) The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Verify the law of conservation of mass for the decomposition of the 187.4 g of C3H5(NO3)3 .
Answer:
Answer:
Kc = 0.20
Explanation:
N₂O₄ ⇄ 2NO₂
moles 5.3mol 2.3mol
Vol 5L 5L
Molarity 5.3/5M 2.3/5M
= 1.06M = 0.46M
Kc = [NO₂]²/[N₂O₄] = (0.46)²/(1.06) = 0.1996 ≅ 0.20
Note:
All credit goes to drpelezo (Ace) who created and explained the answer.
Have a nice day, and I hope this helps
-kiniwih426
How many moles of Chromium(III) nitrate (Cr(NO3)3) are produced when Chromium reacts with 0.85 moles of Lead(IV) nitrate (Pb(NO3)4) to produce chromium(III) nitrate (Cr(NO3)3) and lead? 4 Cr + 3 Pb(NO3)4 → 4 Cr(NO3)3 + 3 Pb
Answer:
[tex]0.64molCr(NO_3)_3[/tex]
Explanation:
Hello there!
In this case, according to the given chemical equation, it turns out possible for us to realize there is a 4:3 mole ratio of chromium(III) nitrate to lead(IV) nitrate, and therefore, we can calculate the moles of the former by applying the shown below stoichiometry setup:
[tex]0.85molPb(NO_3)_4*\frac{3molCr(NO_3)_3}{4molPb(NO_3)_4} \\\\0.64molCr(NO_3)_3[/tex]
Regards!
Particles diffuse
A. from low concentration to higher concentration
B. from higher concentration to lower concentration
C. at any direction
[tex]\huge{ \mathrm{ \underline{ Answer} \: \: ✓ }}[/tex]
The Correct option is :
[tex] \large \boxed{\mathrm{B.}}[/tex]
The particles diffuse from the region of higher concentration to the region of lower concentration.
for example :
At alveoli -during Inhalation, oxygen is in higher concentration in our lungs but in lower concentration blood capillaries, so oxygen diffuses into the blood and carbon dioxide which is in higher concentration in blood diffuses out from the blood capillaries.
_____________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]
is how much a material opposes electric current.
*
insulator
conductor
resistance
short circuit
Answer:
Resistance
Explanation:
Resistance is the measure of the opposition of current in a circuit.
write the chemical formula of 25 compound
Write a hypothesis using IF-THEN - BECAUSE of statement.
Ahmed is curious about the death of the fishes in the ocean. He knows from his environmental chemistry class that pollutants like heavy metals can cause the rapid death of marine organisms. So, Ahmed did an experiment and obtained water samples. He tested that water contains a high amount of lead and chromium.
Answer:
The correct hypothesis would be - "if a water body contains a high amount of heavy metals such as chromium and lead then the death of the fishes will increase because lead and chromium affect the aquatic environment and gills of fishes."
Explanation:
Heavy metal like chromium in a high concentration can affect the gills of the fishes, it is seen in fishes that swim at the point of disposal of metals at thewater surface harm their gills. In high concentration, it becomes toxic for the fishes.
Lead also causes a negative impact on the aquatic ecosystem if accumulated in a high amount in the aquatic environment that leads to the death of the fishes.