Answer:
[tex]Fe_6O_9[/tex]
Explanation:
Hello there!
In this case, since these problems about formulas, firstly require the determination of the empirical formula, assuming that the given percentages are masses, we can calculate the moles and mole ratio of oxygen to iron as shown below:
[tex]n_{Fe}=70/55.85=1.25\\\\n_O=30/16=1.875[/tex]
In such a way, by rounding to the first whole number we multiply by 8 and divide by 5 to obtain:
[tex]Fe_{2}O_{3}[/tex]
Whose molar mass is 159.69 g/mol and the mole ratio of the molecular to the empirical formula is:
479.1/159.69=3
Therefore, the molecular formulais:
[tex]Fe_6O_9[/tex]
Regards!
The equivalence point of a titration corresponds to which of the following?
O the point where equal volumes of acid and base have been used
O Equivalence point is another term for end point
All of the listed options are true
Equivalence point is defined as the point where the pH indicator changes color
O the point where the acid and base have been added in proper stoichiometric amounts
Answer:
E: the point where the acid and base have been added in proper stoichiometric amounts
Explanation:
Equivalence point in titration is simply the point where the amounts of acid and base used just sufficiently reacts chemically to cause neutralization whereas the endpoint is the point where the indicator of the titration changes colour.
The Equivalence point occurs before the endpoint.
Thus, option E is correct.
Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796
Answer:
20.9%
Explanation:
I took the test i hope this helps:)
The percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%. This is calculated using the definition (formula) of percentage by mass of a solution.
What is meant by percentage by mass?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The formula for percentage by mass is given as
percentage by mass = (mass of the solute/ total mass of the compound solution) × 100
Calculating percentage by mass for the given solution:The mass of the solute ( the chemical which is going to be dissolved) HCl
= 27.0 grams
The mass of the solvent (the substance in which a solute dissolve) water
= 102.0 grams
So, the total mass of the solution = 27.0 + 102.0 = 129.0 grams
Then, the percentage by mass = [tex]\frac{27.0}{129.0}[/tex] × 100 = 20.93%
Which is approximate equal to 20.946 at option B.
Therefore, the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%.
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Hey guys I really need help here, please answer this! I'd be most grateful :)
3. Besides the major types of radioactive decay, there are two others: positron emission and electron capture.
• Compare and contrast positrons with electrons.
• Explain how positron emission works and how it causes transmutations.
• Explain how electron capture works and how it causes transmutations.
• Compare the transmutations caused by positron emissions and electron capture.
I've been stuck on this problem for a while and it would mean a lot, thank you again!
Answer:
See Explanation
Explanation:
Positrons are often called positive electrons. They have the same mass and magnitude of charge as the electron but are of opposite sign. This means that they are positively charged while electrons are negatively charged.
In positron emission, a proton is converted into a neutron and a positron. The anti neutrino is a particle that balances the spins.
In electron capture, an electron is converted to a neutron. The anti neutrino is a particle that balances the spins.
When transmutation occurs by positron emission, the mass number of the of the parent nucleus is the same as mass number of the daughter nucleus but the atomic number of daughter nucleus decreases by 1 while the neutron/proton ratio increases.
When transmutation occurs by electron capture, the mass number of the of the parent nucleus is the same as mass number of the daughter nucleus but the atomic number of daughter nucleus decreases by 1 while the neutron/proton ratio increases.
Explain the term orbital.
Answer: a mathematical expression describing the probability of finding an electron at various locations; usually represented by the region of space around the nucleus where there is a high probability of finding an electron
Explanation:
What is formed when a carboxylic acid and an amine combine? Give an example of the type of polymer that is formed by this reaction.
Answer:
The reaction between amines and carboxylic acids to form amides is biologically important. It is through this reaction that amino acids (molecules containing both amine and carboxylic acid substituents) link together in a polymer to form proteins.
How do people determine if a vehicle in which they are sitting is moving?
Group of answer choices
A.by comparing their position to a fixed object inside the vehicle
B.by comparing their position to a fixed object outside the vehicle
C.by comparing their position to a moving object inside the vehicle
D.by comparing their position to a moving object outside the vehicle
Answer:
B.
Explanation:
The only way to make this comparison is by comparing their position to a fixed object outside the vehicle. Comparing to a fixed object inside the vehicle will show no movement, while a moving object inside the vehicle will seem as though the car is still while the object is in motion. Comparing to a moving object outside the vehicle will conflict with the vehicle, if the object is moving at the same speed and direction as the vehicle, it will seem as though neither is moving. The only way to make this comparison correctly is by comparing to an object outside the vehicle that is not moving so that the only variable that can be moving is the vehicle itself.
Calculate the volume of solvent present in a 55.5%
by volume of 10.5 mL alcohol solution.
Answer:
I dont know
Explanation:
good luck
Use the drop-down menus to answer the questions about fronts and weather maps.
Cold fronts appear on weather maps in areas of .
Warm fronts appear on weather maps in areas of .
Answer:
Large temperature and air pressure decrease.
Temperature and air pressure increase.
Explanation:
The correct options about fonts and weather maps are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
What is a cold front and warm front?Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.
A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.
Thus, the correct options are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
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What quality is attributed to water due to “capillary action”?
A. change of liquid water into gaseous phase
B. the ability of water molecules to adhere to the surfaces of objects
C. high volatility
D. vapor pressure
Answer:
I think it's B. The ability of water molecules to adhere to the surfaces of objects
A. If the mass of Hydrogen is 1 amu, what is the mass of Hydrogen in the reactant side of the equation above?
B. what is the mass of Hydrogen on the product side of the equation above?
Answer:
there are 4 hydrogen so
A.the mass of Hydrogen in the reactant side of the equation above is 1×4=4 amu.
B.the mass of Hydrogen on the product side of the equation above =1×4=4 amu.
Note: mass of reactant =mass of product.
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
the doge has the answer
Pb(NO3)4
When two substances at room temperature are combined, the product feels HOT. What
kind of reaction is this?
Answer:
The correct answer is - exothermic reaction.
Explanation:
Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.
In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.
if 6.2 mold of H2SO4 is dissolved to make 750 ml of sulfuric acid what is the molarity
Answer: The molarity of given solution is 8.26 M.
Explanation:
Given: No. of moles = 6.2 mol
Volume = 750 mL (1 mL = 0.001 L) = 0.75 L
Molarity is the number of moles of a substance present in a liter of solution.
Therefore, molarity of given solution is converted as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{6.2 mol}{0.75 L}\\= 8.26 M[/tex]
Thus, we can conclude that the molarity of given solution is 8.26 M.
What are the missing coefficients for C3H8 + o2 = Co2 +H2O
Answer: C3H8 + 5O2 = 3Co2 +4H2O
Explanation: Equations must be balanced
You must have the same amount of C
H and O on both sides of the equation
Convert 7.8 moles of carbon tetrafluoride into grams.
Answer:
686.43363984 is the answer when 7.8 moles is converted.
When 12.00 moles of potassium chlorate decomposes, how many dm3 of oxygen are produced at 325K and 188 kPa?
2KClO3 →2KCl + 3O2
show work pls
Answer:
258.71 dm³
Explanation:
We'll begin by calculating the number of mole of O₂ produced by the decomposition of 12 moles of KClO₃. This can be obtained as follow:
The balanced equation for the reaction is given below:
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Therefore, 12 moles of KClO₃ will decompose to produce = (12 × 3)/2 = 18 moles of O₂.
Finally, we shall determine the volume of the O₂. This can be obtained as follow:
Temperature (T) = 325 K
Pressure (P) = 188 KPa
Number of mole (n) = 18 moles
Gas constant (R) = 8.314 KPa.dm³/Kmol
Volume (V) =?
PV = nRT
188 × V = 18 × 8.314 × 325
188 × V = 48636.9
Divide both side by 188
V = 48636.9 / 188
V = 258.71 dm³
Thus, 258.71 dm³ of oxygen were obtained from the reaction.
explain why hydrogen chloride does not conduct electricity, but a solution of hydrogen chloride and water conduct electricity
A 3.8 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.8 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After the reaction, the contents of the reaction vessel weigh 11.6 g. What is the mass of carbon dioxide released during the reaction
Answer:
3.0 g
Explanation:
The total mass at the beginning of the reaction is:
3.8 g + 10.8 g = 14.6 gFollowing the law of conservation of mass, this same mass has to be present once the reaction is complete. This means that the mass diference between the contents of the reaction vessel after the reaction and the mass at the beginning of the reaction is the mass of released carbon dioxide:
14.6 g - 11.6 g = 3.0 gIn calorimetry, energy is measured through heat transfer from one substance to
another. Which of the following is NOT a method of heat transfer?
Answer:
Refraction
Explanation:
Question 1
What term is used to describe atoms of the same element that have different masses?
O A) radioactive
B) constituents
C) telomers
OD) isotopes
E) None of the above
Answer:
Isotopes
Explanation:
iso means the same like in triangles (isosceles) so the atoms are the same element but different in mass. Since the isotopes have the same number of protons and electrons the isotopes have much the same chemical behavior. Since the isotopes have different numbers of neutrons the nuclear behavior differs.
manganese (V) carbonate + nickel (II) phosphite -->
Answer:
[tex]3Mn_2(CO_3)_5+5Ni_3(PO_3)_2\rightarrow 15NiCO_3+2Mn_3(PO_3)_5[/tex]
Explanation:
Hello there!
In this case, for the given reactants side in this chemical reaction, it is possible for us to firstly write the left side of the undergoing chemical equation as shown below:
[tex]Mn_2(CO_3)_5+Ni_3(PO_3)_2\rightarrow NiCO_3+Mn_3(PO_3)_5[/tex]
Which means that the products are nickel (II) carbonate and manganese (V) phosphite. Next, we balance the reaction as shown below:
[tex]3Mn_2(CO_3)_5+5Ni_3(PO_3)_2\rightarrow 15NiCO_3+2Mn_3(PO_3)_5[/tex]
Which makes 15 carbonate ions, 10 phosphite ions, 15 nicked (II) ions and 6 manganese (V) on both sides of the chemical equation.
Best regards!
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
0.850 moles of N2 originally at 85°C is cooled such that it now occupies 17.55L at 1.25 atm. What is the final temperature of the gas?
The final temperature of the gas is 269.9 K, or -3.25 °C, which was calculated with the help of ideal gas equation.
What is the ideal gas equation?The ideal gas equation gives the relation between pressure, volume and temperature.
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To find the initial volume of the gas. We can use the fact that the number of moles of gas does not change during the cooling process:
n = 0.850 moles
We can also use the ideal gas law to find the initial volume of the gas:
PV = nRT
V = nRT/P
where R = 0.08206 L atm/K mol is the gas constant.
Convert the initial temperature from Celsius to Kelvin:
T1 = 85 °C + 273.15 = 358.15 K
Substitute the given values into the equation:
V₁ = (0.850 mol)(0.08206 L atm/K mol)(358.15 K)/(1 atm) = 24.03 L
Now we can use the combined gas law to find the final temperature:
(P₁V₁/T₁) = (P₂V₂/T₂)
Substitute the given values into the equation:
(1.25 atm)(24.03 L)/(358.15 K) = (P₂) (17.55 L)/(T2)
Solve for T₂:
T₂ = (P₂)(17.55 L)(358.15 K)/(1.25 atm)(24.03 L)
T₂ = 269.9 K
Therefore, the final temperature of the gas is 269.9 K, or -3.25 °C.
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Which of the following would be considered an Exothermic Reaction?*
Ice Melting
Burning wood
Boiling water
Baking a cake
Answer:
Burning wood
Explanation:
the fire releases heat into the air from the burning wood
is benzene saturated or unsaturated?
Answer:
Benzene shows that it is actually unsaturated because it adds hydrogen or chlorine, although only when allowed to react under very vigorous conditions (higher temperature or pressure) compared to those required for alkenes and alkynes.
Explanation:
What is the pH of a 0.235 M Ba(OH)2 solution?
Answer:
13.672
Explanation:
2 moles of OH in Ba(OH)₂
0.235 M × 2 mol OH = 0.47 M OH
pOH = -log[OH-] ; pOH = -log[0.47 M OH] ; 0.328 = pOH (consider significant figures)
14 - pOH = pH because pH + pOH = 14
14 - 0.328 = 13.672 [there are three decimal places after the OH concentration, so there should be in the answer as well - 13.672]
The solubility of N2in blood at 37°C and at a partial pressure of 0.80 atm is 5.6 × 10−4mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2equal to 4.0 atm. Assume that the total volume of blood in the body is 5.0 L. Calculate the amount of N2gas released (in liters at 37°C and 1 atm) when the diver returns to the surface of the water, where the partial pressure ofN2is 0.80 atm.
Solution :
According to Henry's law of solubility, we have c = kp
Henry's law constant, [tex]$k=\frac{c}{p}$[/tex]
[tex]$=\frac{0.00056}{0.80}$[/tex]
= 0.0007 mol/L.atm
When the pressure is = 4 atm
The solubility is c = 0.0007 mol/(L.atm) x 4 atm
= 0.0028 mol/L
Therefore, in a 5 liter of blood, the moles of nitrogen dissolved
= 0.0028 x 5
= 0.014 moles
At the surface, the solubility is = 0.00056 mol/L
So the moles of the nitrogen dissolved = 5 x 0.00056
= 0.0028 moles
Therefore, the number of moles of nitrogen released = 0.014 - 0.0028
= 0.0112 moles
Given total pressure = 1 atm
Temperature = 37 degree C
= 37 + 273
= 310 K
R = [tex]$0.0821\ L -atm/ mol.K $[/tex]
Therefore, volume of the nitrogen is
[tex]$V=\frac{nRT}{P}$[/tex]
[tex]$V=\frac{0.0112 \times 0.0821 \times 310}{1}$[/tex]
= 0.285 L
The volume of 3.73 moles of a gas is 78.3 L at a certain temperature and pressure. At the same temperature and pressure, the moles of gas
that occupies 33.3 L is
Explanation:
) If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? P PV = nRT. 5.6 (12)=460821) T.
A balloon has a volume of 7.00 liters at a pressure of 740 mm Hg. If the temperature remains constant, at what pressure will the volume decrease to 2.00 liters?
a. 749 mm Hg
b. 52.9 mm Hg
c. 211 mm Hg
d. 2590 mm Hg
Answer:
D
Explanation:
P1 x V1 = P2 x V2
7.00(740) = x(2.00)
2590 mm Hg
took me a while because i dont know this, hope its right good luck
Determine the pH of 1.0 x 10-10M NaOH
pH=
Answer:
4
Explanation:
Applying,
pH = 14-pOH.................... Equation 1
But,
pOH = -log(OH⁻)
Where OH⁻ = Hydroxyl ion concentration of NaOH.
From the question,
Given: OH⁻ = (1×10⁻¹⁰) M
Substitute these values into equation 1
pH = 14-log((1×10⁻¹⁰)
pH = 14-10
pH = 4
Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4