Answer:
0.966g of sodium benzoate are in the original sample
Explanation:
The sodium benzoate, B⁻, reacts with HCl as follows:
B⁻ + HCl → BH + Cl⁻
Where 1 mole of benzoate reacts per mole of HCl
The HCl is added in excess. We can find the HCl that reacts with sodium benzoate using the NaOH that reacts with HCl.
When 1 drop change the pH in 1,1 units, this point is the equivalence point. Thus, moles in excess of HCl = Moles of NaOH added are:
0.04650L * (0.393mol / L) = 0.0183 moles NaOH = Moles HCl in excess
Moles HCl added:
0.0500L * (0.500mol/L) = 0.0250 moles HCl added
Moles HCl that react = Moles Sodium benzoate:
0.0250 moles HCl - 0.0183 moles HCl = 0.0067 moles HCl = Moles Sodium benzoate
Mass Sodium benzoate -Molar mass: 144.11g/mol-:
0.0067 moles Sodium benzoate * (144.11g/mol) =
0.966g of sodium benzoate are in the original sampleWhat is the main purpose of the curiosity rover ?
Answer:
What is the main purpose of the curiosity rover ?
Explanation:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
Answer:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
A Question 2 (2 points) Retake question
Potassium chlorate decomposes into potassium chloride and oxygen gas according to
the following equation:
2 KClO3 --> 2 KCl + 3 02
Use the equation above to answer the questions that follow:
How many moles of oxygen will be produced from the decomposition of 276 g of
potassium chlorate?
Do not put the answer in scientific notation. Do not include the substance as part of
your unit. Units should be all lowercase letters and singular (not plural) and no
spaces among units. You will choose from the following units:
Answer:
3.3765 Mol O2
Explanation:
There is no work for this problem
yes needs help......
Answer:
a and b
Explanation:
What is the IUPAC name for NH3?
Answer:
Ammonia
Explanation:
Answer:
nitrogen trihydride
Explanation: correct on edge
QUICK !!! How many moles are in 3.78 x 1025 molecules of CO?
Answer: 63
Explanation: (3.78/6.022)*100
Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 25. g of ethane is mixed with 122. g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to significant digits.
Answer:
73.48 g
Explanation:
The reaction that takes place is:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂OWe convert the given reactant masses to moles, using their respective molar masses:
25 g ethane ÷ 30 g/mol = 0.83 mol ethane122 g O₂ ÷ 32 g/mol = 3.81 mol O₂0.83 moles of ethane would react completely with (0.83*7/2) 2.9 moles of O₂. There are more O₂ moles than that, so O₂ is the reactant in excess and ethane is the limiting reactant.
We calculate the produced moles of CO₂ using the moles of the limiting reactant:
0.83 mol C₂H₆ * [tex]\frac{4molCO_2}{2molC_2H_6}[/tex] = 1.67 mol CO₂Finally we convert CO₂ moles to grams, using its molar mass:
1.67 mol CO₂ * 44 g/mol = 73.48 gPhosphorus is commercially prepared by heating a mixture of calcium phosphate, sand, and coke in an electric furnace. The process involves two reactions. 2 Ca3(PO4)2(s) 6 SiO2(s) 6 CaSiO3(l) P4O10(g) P4O10(g) 10 C(s) P4(g) 10 CO(g) The P4O10 produced in the first reaction reacts with an excess of coke (C) in the second reaction. Determine the theoretical yield of P4 if 293.5 g Ca3(PO4)2 and 378.5 g SiO2 are heated. (No Response) g If the actual yield of P4 is 44.9 g, determine the percent yield of P4.
Answer:
76.6% is percent yield of P₄
Explanation:
Percent yield is defined as 100 times the ratio of actual yield and theoretical yield. To solve this quesiton we need to find the theoretical yield of the reaction. Using:
2Ca₃(PO₄)₂(s) + 6SiO₂(s) → 6CaSiO₃(l) + P₄O₁₀(g)
P₄O₁₀(g) + 10C(s) → P₄(g) + 10CO(g)
We need to find the moles of Ca₃(PO₄)₂ and SiO₂ to find limiting reactant. With limiting reactant we can find moles of P₄O₁₀ = Moles of P₄. We must convert the moles of P₄ to mass using Molar mass (P₄ = 123.895g/mol):
Moles Ca₃(PO₄)₂ -Molar mass: 310.1767g/mol-
293.5g * (1mol / 310.1767g) = 0.9462moles
Moles SiO₂ -Molar mass: 60.08g/mol-:
378.5g * (1mol / 60.08g) = 6.30 moles
For a complete reaction of 6.30 moles of SiO₂ there are required:
6.30 moles SiO₂ * (2 moles Ca₃(PO₄)₂ / 6 moles SiO₂) =
2.10 moles Ca₃(PO₄)₂. As there are just 0.9462 moles, Ca₃(PO₄)₂ is limiting reactant
Moles P₄O₁₀ = Moles P₄:
0.9462moles Ca₃(PO₄)₂ * (1mol P₄O₁₀ / 2 mol Ca₃(PO₄)₂) = 0.4731 moles P₄O₁₀ = Moles P₄.
The mass is:
0.4731 moles P₄ * (123.895g / 1mol) = 58.6g = Theoretical yield.
Percent yield is:
44.9g / 58.6g * 100 =
76.6% is percent yield of P₄Someone answer this question by me
I'm giving 100 points for that question
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If you don't want to get reported and want brainiest, answer the question and don't just spam some random things. I really need help with this that's why I'm giving so many points
Answer:
Uiiikjhb+2
Explanation:
I’m gonna swinggggggf
What is the percent enantiomeric excess (ee) of a mixture that has 86% of one enantiomer and 14% of the other
Answer:
86% - 14% = 72%
Explanation:
A reactive metal that burns with oxygen and makes a white bright light is?
sodium
iron
magnesium
copper
Answer:
it is magnesium hope it helps
Helium gas is being pumped into a rigid container at a constant temperature. As a result, the pressure of helium in the container is increasing. Select the one correct statement below.
a) As the pressure increases, helium atoms move faster, on average.
b) As the pressure increases, helium atoms move more slowly, on average.
c) As the pressure increases, helium atoms stay closer to the wall of the container, on average.
d) As the pressure increases, the volume of the container must decrease.
e) As the pressure increases, there are more collisions of helium atoms with the container wall.
Answer: e. As the pressure increases, there are more collisions of helium atoms with the container wall.
Explanation:
We are given the information that helium gas is pumped into a rigid container at a constant temperature.
Due to this reason, there was a rise in the pressure of helium in the container. We should note that as the pressure rises, there are more collisions of helium atoms with the container wall.
The increase in the pressure of He atoms results in the increased collision of atoms with the wall. Thus, option E is correct.
The helium in the container is assumed to be an ideal gas. The ideal gas reaction is given as:
[tex]PV=nRT[/tex]
Where,
P= PressureV=volumen=molesR=Rydberg constantT=temperatureWhat happens to gas with an increase in pressure?The ideal gas equation depicts that the gas is contained in a closed container. Thus, the moles, n of gas are constant. The pressure is pumped at a constant temperature, thereby T is also constant.
The R is a constant in the ideal gas equation. The increase in the pressure of the container results in the increased kinetic energy of the helium atoms.
The increase in the collisions is observed for the molecules with the container wall.
Thus, with the increase in pressure, the collisions in the atoms increase. Hence, option E is correct.
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Look at the potential energy diagram below. What amount of energy does the products have ?
100
80
PE
50
AB
40
C D
20
Progress of the reaction
40 KJ
60 KJ
O 20 KJ
80 KJ
Answer:
20 kJ
Explanation:
The products are C + D which is on the right side of the diagram. And it says it has 20 kJ of energy.
The density of Diamond is 3.51 g/cm3, and the density of platinum is 21.43 g/cm3. If equal masses of diamond and platinum are transferred to equal volumes of water in separated graduated cylinders, which graduated cylinder would have the greatest volume change
Answer:
Explanation:
Diamond has lesser density than platinum . So , if we take equal mass of both , the volume of mass of platinum will be far less .
The density of both diamond and platinum are more than water so both of them will be drowned in water completely . They will not float . On being drowned , platinum will displace lesser volume of water because of its less volume . So volume change in case of platinum mass will be far less . The volume change for diamond will be more because of its bigger size.
What causes anions and cations to form ionic bonds?
Answer:anions have a negative charge and cations have a positive charge therefor they can form ionic bonds
Explanation:
The image shows a ship using sonar to locate a school of fish. Which data are used to determine the distance of the ship from the fish? O A. The amount of time it takes the sound waves to travel from the boat to the fish B. The number of sound waves that bounce off the fish C. The number of sound waves the ship emits D. The amount of time it takes the sound waves to travel to the fish and back to the boat
The factor that would help to determine the distance of the ship from the fish would be The amount of time it takes the sound waves to travel to the fish and back to the boat.
What is distance traveled by a wave?This is the term that is used to refer to the total distance that would be traveled by a wave in a given cycle. The distance is usually calculated by the use of lambda. The use of Sonar would have to be determinant on the sound that is being heard.
We would have to check the way that the sound would have to come from the ship and then the way that it would have to be go back to the given boat that is used to report and find the school of fisn.
Hence we would say that The factor that would help to determine the distance of the ship from the fish would be The amount of time it takes the sound waves to travel to the fish and back to the boat.
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The temperature of a 10g sample of iron was raised by 25.4ᵒC with the addition of 114 J
of heat. What is the specific heat of iron?
Answer:
28956J
Explanation:
Specific heat capacity is equal to mass × heat capacity × temperature change
Shc = mCtheta
= 10 × 114 ×25.4
= 28956J
Based on your understanding of color's relationship to wavelength, identify the approximate wavelength of light (nm) emitted by strontium when it was burned in Part C. (No quantitative data was collected for this; you are giving an approximate value only, based on what you observed.) Explain your reasoning in full, making sure to cite specific data and observations to support your answer.
Answer:
The flame colour of strontium is red. Red has a wavelength of around 620 to 750 nm.
Explanation:
Visible light is part of the electromagnetic spectrum. The electromagnetic waves are composed of electric and magnetic fields.
The visible spectrum is composed of seven different wavelengths that corresponds to different colours. When a metallic element is exposed flame, one of these colours is observed. This is commonly called the flame test.
The flame colour of strontium is red. Red has a wavelength of around 620 to 750 nm.
The approximate wavelength of light (nm) emitted by strontium when it was burned is red, where red has a wavelength of round 620-750 nm.
Wavelength of light emitted by strontiumGenerally, Visible mild is phase of the electromagnetic spectrum. the electromagnetic waves are composed of electric powered and magnetic fields. When a metal factor is uncovered flame, one of they seven colors of visible spectrum is seen.
The flame shade of strontium is red, where red has a wavelength of round 620-750 nm.
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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of pentane, ethanolamine, diethylamine, glycerol, and carbon tetrachloride. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density pentane 0.63gmL, ethanolamine 1.0gmL, diethylamine 0.71gmL, glycerol 1.3gmL, carbon tetrachloride 1.6gmL Next, the chemist measures the volume of the unknown liquid as 1737.cm3 and the mass of the unknown liquid as 1.23kg . Calculate the density of the liquid. Be sure your answer has the correct number of significant digits.
Answer:
0.71 g/mL
The liquid is diethylamine
Explanation:
Mass of the liquid = 1.23 kg of 1.23 * 10^3 g
Volume of the liquid = 1737.cm3
Let us remember that density is obtained as;
Density= mass/volume
Density= 1.23 * 10^3 g/1737cm^3
Density= 0.71 g/cm^3
Since we know that 1 mL=1 cm3 . So, 1 g/mL=1 g/cm3
So we can also write;
Density= 0.71 g/mL
The liquid is diethylamine
In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates the use of the gas constant, R, equal to ________. In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates the use of the gas constant, R, equal to ________. 8.314 m3-Pa/mol-K 0.08206 atm L mol-1K-1 1.987 cal mol-1K-1 62.36 L torr mol-1K-1 none of the above
Answer:
[tex]8.314\ \text{m}^3\text{Pa/mol K}[/tex]
Explanation:
Let us find the unit of the gas constant R from the ideal gas equation. We substitute the units of the quantities rearrange them and get the units of the gas constant.
P = Pressure = Pa
V = Volume = [tex]\text{m}^3[/tex]
n = Moles = mol
T = Temperature = K
[tex]PV=nRT\\\Rightarrow R=\dfrac{PV}{nT}\\\Rightarrow R=\dfrac{\text{Pa m}^3}{\text{mol K}}[/tex]
Here, [tex]\text{Pa}[/tex] is used so the gas constant value that must be used is [tex]8.314\ \text{m}^3\text{Pa/mol K}[/tex].
100 POINTS PLEASE ANSWER!
Read the following chemical equation.
Fe + O2 → Fe2O3
Which of the following fractions can be used for the mole ratio to determine the mass of Fe from a known mass of Fe2O3?
four over two
three over two
two over three
two over four
Answer:
Answer would be 4/2
Explanation:
A is the best answer choice because it was between A and D but 2 is not the denominator so it couldnt be D
Fe + O2 → Fe2O3 four over two fractions can be used for the mole ratio to determine the mass of Fe from a known mass of Fe2O3. Therefore, option A is correct.
What do you mean by mole ratio ?The mole ratio is a conversion factor that is derived from the coefficients of the compounds in a balanced equation. As a result, the mole ratio is used to convert between quantities of compounds in a chemical reaction.
Using the atomic masses, convert the mass of each element to moles of each element. Divide the number of moles of each element by the smallest number of moles to find the ratio or moles of each element.
Four over two is the best answer choice because it was between A and D, but 2 is not the denominator, so it couldn't be D.
Thus, four over two fractions can be used for the mole ratio to determine the mass of Fe from a known mass of Fe2O3, option A is correct.
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Energy is released when new bonds are formed.
(true of false btw)
Answer:
False. Energy can only be released when bonds are broken. consider the result when atoms are tron appart.
QUESTION 3
How many atoms of Xe does 7.84 moles of Xe contain?
Mole (mol): the amount of material counting 6.02214 × 1023 particles. The value of the mole is equal to the number of atoms in exactly 12 grams of pure ... A silver ring contains 1.1 x 1022 silver atoms. How many moles of silver are in ... Answers. 1. (a) 2.26 × 10. 24 silver atoms; (b) 1.42 × 10. 24 xenon atoms (c) 3.07 × 10.
Explanation:
1
2
3
4
5
Which is the electron configuration for bromine?
1s²2s22p63s23p4s23d104p5
1s22s²2p3s23p64s23d104p
1s 2s22p63s23p'4s23d104p5
O1s22s22p3s23p64s23dº4p5
Answer:
1[tex]s^{2}[/tex]2[tex]s^{2}[/tex]2[tex]p^{6}[/tex]3[tex]s^{2}[/tex]3[tex]p^{6}[/tex]3[tex]d^{10}[/tex]4[tex]s^{2}[/tex]4[tex]p^{6}[/tex] (alternatively 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6)
Explanation:
The correct configuration for bromide ([tex]Br^{-}[/tex]) is:
1[tex]s^{2}[/tex]2[tex]s^{2}[/tex]2[tex]p^{6}[/tex]3[tex]s^{2}[/tex]3[tex]p^{6}[/tex]3[tex]d^{10}[/tex]4[tex]s^{2}[/tex]4[tex]p^{6}[/tex] (it has one more electron in 4p orbital than bromine)
You can also write it as [Ar] [tex]4s^{2}[/tex] [tex]3d^{10}[/tex] [tex]4p^{6}[/tex], since noble gases are very stable
First can't be correct because there is nothing in 3p orbital and 4p has only 5 electrons here
1s² 2s2 2p6 3s2 3p 4s2 3d10 4p5
Second can't be correct because there is nothing in 2p and 4p orbitales 1s2 2s² 2p 3s2 3p6 4s2 3d10 4p
Third can't be correct because there is nothing in 3p orbital and 4p has only 5 electrons here
1s 2s2 2p6 3s2 3p' 4s2 3d10 4p5
Fourth can't be correct because there is nothing in 2p and 3d orbitales, and 4p has only 5 electrons here
1s2 2s2 2p 3s2 3p6 4s2 3dº 4p5
9. How does WNS negatively affect bats?
Answer:
Scientists hypothesized that WNS, caused by the fungus Pseudogymnoascus destructans, makes bats die by increasing the amount of energy they use during winter hibernation. Bats must carefully ration their energy supply during this time to survive without eating until spring
Explanation:
What is a neuron..............
Answer:
Neurons are fundamental units of the brain and nervous system.the cells are responsible for receiving sensory input from the external world for sending motor commands to our muscles and for transforming and relaying electrical signals every step in between.
Nitric acid decomposes in light to form nitrogen dioxide, water, and oxygen, according to the following chemical equation.
4HNO3 (l â 4NO2(g) + 2H2O (l) + O2(g)
If 2.5 g nitric acid decomposes, what is the total volume of gas produced?
a. 0.050L
b. 0.22
c.0.89
d. 1.1L
Answer:
b. 0.22 L
Explanation:
Step 1: Write the balanced equation
4 HNO₃(l) ⇒ 4 NO₂(g) + 2 H₂O(l) + O₂(g)
Step 2: Calculate the moles corresponding to 2.5 g of HNO₃
The molar mass of HNO₃ is 63.01 g/mol.
2.5 g × 1 mol/63.01 g = 0.040 mol
Step 3: Calculate the moles of O₂ produced from 0.040 moles of HNO₃
The molar ratio of HNO₃ to O₂ is 4:1. The moles of O₂ produced are 1/4 × 0.040 mol = 0.010 mol.
Step 4: Calculate the volume corresponding to 0.010 moles of O₂
Assuming the reaction takes place at standard temperature and pressure, the volume of 1 mole of O₂ is 22.4 L.
0.010 mol × 22.4L/1 mol = 0.22 L
In the Dumas Method, the volatile sample
is heated. As the sample evaporates, air
is forced out of the container until the
entire container is filled with the vapor of
the sample.
True or False
Answer:
true
Explanation:
it's true I have the same course
Which of the following describes a competitive relationship?
a.Owl and field mouse
b. Oak tree and pine tree
c.Spider and fly
d.Shark and remora fish
How long does it take light to travel from the Earth to the Sun? The speed of light is 2.998×10^5 km/s and the Sun is 1.496×10^8 km away from Earth, on average.
To solve this we must be knowing each and every concept related to speed. Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.
What is speed?Speed may be defined as the distance traveled by an item in the amount of time it requires to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.
The average speed is the total distance traveled by the item in a particular time frame. A scalar quantity is average speed. The magnitude of a scalar quantity indicates that it has no direction.
Mathematically,
speed of light=2.998 x 10⁵m/s.
Time = (1.496x10⁸ km x 1000m/km) / (2.998 x 10⁵ m/s)
=5x10⁵s
Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.
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What are the correct units for molar mass?
a.
b. mol
C. g/mol
d. g*mol
Answer:
the correct unit for molar mass is g/mol
Answer:
The molar mass of a compound tells you the mass of 1 mole of that one substance. Tt tells you the number of grams per mole of a compound. The units for molar mass are, therefore, grams/mole.
Explanation:
BOOM BIG BRAIN