A chemistry student measures out 41 grams of sodium hydroxide, NaOH. They react it with an excess of hydrochloric acid, HCl, forming water and sodium chloride, NaCl. After boiling away the water and the HCl, they find the mass of the NaCl to be 25.5 grams. What is their percent yield? (Don't forget to write a balanced equation)
Answers
Related Questions
HURRYYY !!!! What radioactive isotope produces Aluminum-13 by beta decay
Answers
Answer:
I DONT KNOW SORRY
Explanation:
Answer:
Iodine-131 is more likely to undergo beta decay than positron decay.
Any shipment of peanuts that contains more than 25 ppb of this dangerous fungus is rejected. A company receives 24 t of peanuts to make peanut butter. What is the maximum mass, in g, of fungus that is allowed? Hint 1 t = 1000 kg.
Answers
Answer:
0.60g of the fungus can be allowed
Explanation:
The maximum concentration of the fungus that can be allowed is 25 ppb, that is 25mg/t.
As the peanuts are 24t, the mass of fungus that can be allowed is:
24t * (25mg/t) = 600mg of the fungus can be allowed. In grams are:
600mg * (1g/1000mg) =
0.60g of the fungus can be allowedAnswer:
0.5g of toxin
Explanation:
ppb = mass of solute/ mass of solution x 10^9
ppb = mass of fungus/ mass of peanuts x 10^9
25ppb = (x/2 x 10^7g) x 10^9
x = (25)(2 x 10^7g)/ 10^9
x = 0.5g of toxin
x represented the unknown mass of solute (fungus), in which we solved for. We already knew we were using the ppb formula, which is mass of solute/ mass of solution x 10^9, because the question mentions that there are 25ppb of peanuts in the shipments. In the calculations, you can see that I substituted the mass of peanuts with 2 x 10^7g. I did this because the question mentions that there are 20t of peanuts and since each t = 1000kg, I multiped 20 x 1000 to get 20 000kg. In my formula for ppb, I know that I have to use grams of solution, not kilograms. Knowing this, we follow the formula for ppb and substitute our known values and solving for unknown values.
I need help w this pls
Answers
Answer:
70..... I think
Explanation:
Cuz if the bus travels 35 km every 30 mins this means that it travels 70 km per hour
Questions
1 Explain why a solid expands when it is heated.
2 Explain how the liquid in a thermometer changes so that it can be used to
measure a temperature.
3 Use particle theory to explain why solids and liquids cannot be compressed
(squashed into a smaller volume).
4 Use particle theory to explain why liquids and gases can flow.
Answers
Answer:
answer of question 1 is
Explanation:
solids are denser than liquid and gases because solid particles are closely packed and do not have any empty spaces between their particels so when solid will heated its particles will spread and there will have more spaces between them so a solid expand on heating.
What is the mass, in grams, of 1.75 x 1020 molecules of caffeine, C8H10N4O2?
Answers
H: 10 atoms x atomic mass of hydrogen (1.01 g/mol) = 10.10 g/mol
N: 4 atoms x atomic mass of nitrogen (14.01 g/mol) = 56.04 g/mol
O: 2 atoms x atomic mass of oxygen (16.00 g/mol) = 32.00 g/mol
Adding these values together, we get:
96.08 g/mol + 10.10 g/mol + 56.04 g/mol + 32.00 g/mol = 194.22 g/mol
Therefore, the molecular mass of caffeine is approximately 194.22 g/mol.
To find the mass of 1.75 x 10^20 molecules of caffeine, we can use the following equation:
Mass = (Number of molecules) x (Molecular mass)
Mass = (1.75 x 10^20) x (194.22 g/mol)
Calculating the result:
Mass ≈ 3.40 x 10^22 g
Therefore, the mass of 1.75 x 10^20 molecules of caffeine is approximately 3.40 x 10^22 grams.
The morning temperature in a city is 41°F. If a sunny, mild day is forecast, which temperature is most likely for 2:00 p.m.?
Answers
Answer:
huh
Explanation:
Which reaction best illustrates the behavior of the weak base h2po4- in aqueous solution?
Answers
The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)
What is a weak base?
A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.
Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.
Examples of Weak Bases.
Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...
2 Trimethylamine (N (CH₃) ₃)₃ Pyridine
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The substituents on an aromatic ring will affect both the ______ at which the compound reacts with electrophiles and the _____ of any new substituents on the ring
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The substituents on an aromatic ring have a significant impact on the reactivity of the ring towards electrophiles and the properties of any newly added substituents.
Aromatic compounds are characterized by their ring of alternating double bonds and can have a variety of substituents attached to them. The nature of these substituents can significantly influence the properties of the ring, including its reactivity and the effects of any new substituents. The reactivity of an aromatic ring towards electrophiles is largely dependent on the electronic properties of the substituents. Substituents that are electron-donating, such as -NH2 or -OH, will increase the electron density of the ring and make it more reactive towards electrophiles. In contrast, electron-withdrawing substituents, such as -NO2 or -CN, will decrease the electron density of the ring and make it less reactive towards electrophiles.
Additionally, the substituents on an aromatic ring can also affect the properties of any new substituents added to the ring. For example, a substituent that is electron-donating will generally increase the electron density of the ring and make it more likely for new substituents to be added in positions adjacent to the original substituent. In contrast, electron-withdrawing substituents will generally decrease the electron density of the ring and make it more likely for new substituents to be added in positions opposite to the original substituent. Overall, the substituents on an aromatic ring play an important role in determining the reactivity of the ring towards electrophiles and the properties of any newly added substituents. By carefully choosing the appropriate substituents, it is possible to tune the properties of the aromatic ring for a wide range of applications.
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Which one of these is not involved in a Combustion reaction ?
- production of water h20
-Usually, requires activation energy-to get started
-Requires a Fuel
-Production of Carbon Dioxide CO2
-Evolution of a gas (usually bubbles)
-Requires oxygen ( O2) gas as a reactant
Answers
One of these is not involved in a Combustion reaction is a. The production of water (H²O) is not involved in a combustion reaction.
Combustion reactions are typically exothermic reactions that involve a fuel, oxygen gas (O²), and activation energy to get started. During the reaction, the fuel is oxidized by the oxygen gas, resulting in the production of heat, light, and usually the production of carbon dioxide (CO²) as a byproduct. Evolution of gas, such as the formation of bubbles, is also common in combustion reactions.
However, water is not produced as a byproduct of the reaction, as it is not involved in the oxidation of the fuel. In fact, water is commonly used to extinguish fires caused by combustion reactions, as it can cool the reaction and prevent further oxidation of the fuel. So therefore the correct answer is a. the production of water (H²O) is not involved in a combustion reaction.
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Which commercial technology commonly uses plasmas?
O a radio
O a race car
O a television a microwave oven
Answers
The commercial technology that uses plasmas is C. A television.
What is plasma ?Plasma is a state of matter that is similar to gas, but the atoms are ionized, meaning that they have lost or gained electrons. Plasmas are used in a variety of commercial technologies, including:
Plasma TVs use plasma to create images. The plasma is contained in a thin layer of gas between two glass plates. When an electric field is applied to the plasma, it emits light. The color of the light depends on the type of gas used.
Plasma lamps are used in a variety of lighting applications, including streetlights, headlights, and backlighting for LCD displays.
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how many moles of n2o, nitrous oxide, are contained in 250. ml of the gas at stp? r = 0.08206 l⋅atm/k⋅mol
Answers
The number of moles of N2O (nitrous oxide) in 250 mL of the gas at STP is 0.0112 moles
To find the number of moles of N2O (nitrous oxide) in 250 mL of the gas at STP (standard temperature and pressure), you can use the ideal gas law equation: PV = nRT.
At STP, the temperature (T) is 273.15 K, and the pressure (P) is 1 atm. The volume (V) is given as 250 mL, which needs to be converted to liters: 250 mL × (1 L/1000 mL) = 0.250 L. The gas constant (R) is provided as 0.08206 L⋅atm/K⋅mol.
Now you can plug in the values into the equation:
(1 atm) × (0.250 L) = n × (0.08206 L⋅atm/K⋅mol) × (273.15 K)
To solve for the number of moles (n), you can rearrange the equation:
n = (1 atm × 0.250 L) / (0.08206 L⋅atm/K⋅mol × 273.15 K)
n ≈ 0.0112 moles
Therefore, approximately 0.0112 moles of N2O are contained in 250 mL of the gas at STP.
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you assumed the salt produced (~0.25 m nacl after reaction) did not affect the specific heat (cs) and therefore using the specific heat of water in equation 1 was acceptable. was this a reasonable assumption? (hint: calculate the amount of salt and water, then show the solution is mostly water). provide numerical evidence to support your explanation.
Answers
The procedure is correct, also, you consideration is too, NaCl concentration doesnt affect the heat transference, because the teoretical value is -55.96 kJ /mol.
How to explain the informationWe can probe that the solutions are water in major proportion, for that we must calculate the molar fraction for all components in its respective solutions:
a) NaOH, 50 mL , 0.995 M
mass of NaOH= (0.995 M*0.050 L)*40 gmol-1= 1.99 g of NaOH
moles of water= 48.01 g/18.015gmol-1= 2.66 mol of water
b) HCl, 50 mL, 0.923 M
mass of HCl= (0.050 L*0.923M)*36.45gmol-1= 1.682 g of HCl
moles of water: 48.32 g H2O/18.015 gmol-1= 2.682 mol of water
c) Mixture, volume is 100 mL, C= 0.25M
mass of NaCl= (0.25M*0.100 L)*58.44 gmol-1= 1.461 g of NaCl
moles of water= 98.539 g/18.015gmol-1= 5.47 mol of water
In all cases, the mainly component in the solutions is water.
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A person walks at 2 km/h for four hours. What is their displacement?
Answers
Answer:
4km
Explanation:
How many units the function y = |x| - 3 is translated from the parent function?
Answers
The function y = |x| - 3 is translated 3 units downward from the parent function.
How do we explain?The parent function of y = |x| is the absolute value function. The function y = |x| - 3 is obtained by subtracting 3 from the parent function.
we make a comparison in order to determine the translation of the function, it to the parent function.
In the question, the translation is in the vertical direction and because we subtract 3 from the parent function, the graph of y = |x| - 3 is shifted downward by 3 units compared to the parent function y = |x|.
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Which indicator is yellow in a solution with a ph of 9. 8.
Answers
Answer:
methyl orange
Explanation:
i hope i hrlped you
Is this equation balanced
Answers
Answer:
no that is not balanced again try to solve them
SENSORCAINE/EPINEPHRINE is an injectable solution that contains 0.25% w/v bupivacaine HCl and 1:200,000 w/v epinephrine. How much epinephrine (mg) would be contained in a 50-mL vial of this solution? Please round to the nearest hundredth. Please show the work up steps. (answer is 0.25 mg)
Answers
A 50-mL vial of SENSORCAINE/EPINEPHRINE solution contains approximately 0.25 mg of epinephrine. This is calculated based on the concentration of 1:200,000 w/v in the solution.
To determine the amount of epinephrine (mg) in a 50-mL vial of SENSORCAINE/EPINEPHRINE solution, we need to consider the concentration of epinephrine in the solution. The solution contains 1:200,000 w/v epinephrine, which means that for every 1 part of epinephrine, there are 200,000 parts of the solution.
To calculate the amount of epinephrine in the solution, we can use the following formula:
Amount of epinephrine = Total volume of solution (mL) × Concentration of epinephrine (mg/mL)
In this case, the total volume of the solution is 50 mL, and the concentration of epinephrine is 1:200,000 w/v. To convert the concentration to mg/mL, we divide 1 mg by 200,000 mL:
Concentration of epinephrine (mg/mL) = 1 mg / 200,000 mL = 0.000005 mg/mL
Finally, we can calculate the amount of epinephrine in the 50-mL vial:
Amount of epinephrine = 50 mL × 0.000005 mg/mL = 0.00025 mg
Rounding to the nearest hundredth, the amount of epinephrine in a 50-mL vial of SENSORCAINE/EPINEPHRINE solution is 0.25 mg.
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Why does Watney get left behind on Mars?
Answers
Answer:
I think it's because he was presumed dead after a storm, or like a problem with his suit
Explanation: I think it was because somebody thought he was dead in the storm? And the remaining of the crew were forced to leave him behind thinking he was dead on mars.
I might be right, might not ^^
What is an atom?
Hshshdgwbdhwjshdhshshsbsh
Answers
What is the name of this hydrocarbon?
hexane
O heptane
O octane
O pentane
Mark this and return
H H H H H
|||||
H-C-C-C-C-C-H
|||II
H H H H H
Save and Exit
Next
Submit
Answers
Answer:
alkanes alkens alkenes and a bromatic hydrocarbons
Answer:
\(\huge\boxed{\sf Pentane}\)
Explanation:
The given compound has:5 carbonsall single bondsPrefix for 5 carbons = Pent
Suffix for all single bonds = ane (since the compound is alkane)
So, the name of this hydrocarbon is:
Pentane\(\rule[225]{225}{2}\)
enter your answer in the provided box. an important industrial route to extremely pure acetic acid is the reaction of methanol with carbon monoxide: h5sil950 use bond energies to calculate the heat of reaction.
Answers
According to the question, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.
What is the Heat of reaction?The heat of reaction may be defined as the amount of energy that is significantly absorbed or liberated by the system in order to form the products. This is calculated on the basis of bond energies.
The energy constituent by each bond in the reactant has been the heat of the reactant, and the energy of the product has been the heat of the product.
The heat of the reaction can be calculated by the following formula:
H= \(H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t\).The reactant molecules are \(CH_3OH\) and C≡O.
The bond energy of the reactant is as follows:
\(H_r_e_a_c_t_a_n_t\) = 3 × C-H + C-O + O-H + C≡O.
= 3 × 413 + 358 + 467 + 1070
= 3134 KJ/mol.
The product molecule has been \(CH_3COOH\).
The bond energy of the product is as follows:
\(H_p_r_o_d_u_c_t\) = 3 × C-H + C-O + O-H +C-C + C = O.
= 3 × 413 + 358 + 467 + 347 + 745.
= 3156 KJ/mol.
The heat of the overall reaction is as follows:
ΔH = \(H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t\)
= 3134 - 3156 = -22KJ/mol.
Therefore, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.
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A chemist conducted a precipitation reaction in which they added 35.5 mL of 0.125 M copper(II) sulfate to 50.00 mL of 0.150 M sodium hydroxide. The anion that was left over was subsequently precipitated by adding calcium chloride to the reaction mixture. What mass of the calcium chloride was added
Answers
The mass of CaCl2 is 0.076gram.
The molar mass of a compound is just the molar hundreds of every detail inside the compound brought up. Since the molar mass of Calcium is 40.08 g and the molar mass of Chlorine is 35.45, it might be 40g.08g+35.45g+35.45g (with 2 Chlorines in step with the subscript.) That leaves you with 110.98 g
Calcium and chlorine are the 2 factors in our instance. The molar loads of Ca (forty.08g/mol) and Cl (35.45g/mol) need to then be determined. Now that we have the masses of calcium and each chlorine atom, we are able to truly place them together to get the whole compound's molar mass, which is a hundred and 10.98 g/mol.
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10. Haley the hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
What is her speed?
Answers
Answer:
4
Explanation:
Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.
The speed of Haley the hummingbird is 4 m/s.
From the question,
We are to calculate the speed of Haley the hummingbird
Speed is given by the formula
\(Speed =\frac{Distance\ traveled}{Time\ taken}\)
From the given information,
The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
That is,
The bird can cover a distance of 20 meters in 5 seconds.
Therefore,
Speed of the hummingbird = \(\frac{20}{5}\)
Speed of the hummingbird = 4 m/s
Hence, the speed of Haley the hummingbird is 4 m/s.
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Rubidium will react with oxygen in which of the following formulas?
RbO
RbO2
Rb2O
Rb3O2
Answers
Answer:
C-Rb20
Explanation:
The chemical formula for Rubidium oxide is Rb20.
Hope this helps!
Name the two gases that make up most of the air.
Answers
Answer:
Air is mostly gas
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Explanation:
plz mar k me brainlist
have a nice day
Hope this helps
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What type of representative particle does KClO3 have?
atoms
formula units
molecules
Answers
Answer:
formula units
Explanation:
\($KClO_3$\) is potassium chlorate. It is an ionic compound containing potassium, chlorine and oxygen. The ion in potassium chlorate are held together by the ionic bonds in the lattice structure.
A representative particle may be defined as the smallest unit for which the substance exists in its natural form. For most of the elements, atom is the representative particle. Molecule is the representative particle for diatoms and molecular compounds. But for ionic compounds such as \($KClO_3$\) , NaCl, etc. . the representative particle is its formula units.
g nickel can be plated from aqueous solution according to the following half reaction. how long would it take (in min) to plate 29.6 g of nickel at 4.7 a?
Answers
It would take 345.7 minutes in a plate.
Justification: It serves as an illustration of Faraday's First Law of Electrolysis.
According to this, the quantity of material deposited is directly inversely related to the quantity of voltage transmitted.
W=Zit, =E/96500, = E it/96500, and E=58.7 (molar mass of Ni)/2 (charge on Ni)=29.3 t=W96500/E I = 29.6x96500/29.3x4.7, = 20742.1 sec, = 345.7 min.
Nickel is it uncommon on Earth?It is the fifth most prevalent element on earth and is widely distributed throughout the crust and core of the planet. Along with iron, nickel is a frequent metal in meteorites and is also present in trace amounts in saltwater, plants, and animals.
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Select the correct answer.
0.22 M
HCI
Unknown
LiOH
What is the concentration of the base (LIOH) in this titration?
1.0 ml
0.5 ml
Initial
burette
reading
Final
burette
reading
13.3 ml
18.5 ml
OA
0.16 M
ОВ.
0.15 M
OC. 0.22 M
OD
18 M
O E
0.5 M
Daset
Answers
Answer:
=0.15M
Explanation:
To get the moles of the unknown LiOH, calculate the number of moles of HCl in 12.3mL.
Using the stoichiometric coefficient, mole ratio 1:1.
This means that the number of moles is the same. This number of moles is contained in 18mL. Then Calculate the molarity (concentration) which is in 1000mL
See the explanation from the image I have shared with you for calculations.
2. (a) starting from benzene, propose a viable synthesis for the para-product below. for each step, show all necessary reagents/conditions and draw the major product expected after each step in your proposed synthesis. (b) discuss why minimal ortho product is observed in this synthesis.
Answers
Due to steric crowding between -CH2-CH(CH3)2 and -CH3, ortho product is the minimum.
Benzene is used on the whole as a solvent within the chemical and pharmaceutical industries, as a starting material and an intermediate in the synthesis of numerous chemical substances, and in gasoline.
Benzene is a broadly used commercial chemical. Benzene is found in crude oil and is a main part of gasoline. it's used to make plastics, resins, synthetic fibers, rubber lubricants, dyes, detergents, pills, and pesticides.
Benzene is one of the most usually acknowledged fragrant compounds with the chemical components C6H6. Benzene is produced certainly by means of volcanoes and woodland fires.
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the predominant greenhouse gas produced by human use of fossil fuels is __________.
Answers
Answer:
carbon dioxide
Explanation:
the carbon dioxide is bad for animals and can even harm the nature around us. Carbon dioxide is overall a non-safe gas for some animals and is used everyday.