Using Avogadro's law, we know the amount of moles in the sample is
[tex]\frac{6.87 \times 10^{23}}{6.022 \times 10^{23}}=1.1408170043175 \text{ mol}[/tex]
Therefore, the atomic mass is:
[tex]\frac{26.1}{1.1408170043175}=\boxed{22.9 \text{ g/mol (to 3 sf)}}[/tex]
Still using the reaction from the video, what is the limiting reagent when 2 moles of Al are reacted
with 2 moles of O₂? About how many total reactions can you run?
O Al, 0.67 reactions
O Al, 0.5 reactions
Oxygen, 0.67 reactions
O Oxygen, 0.5 reactions
The limiting reagent will be Al
What are limiting reagents?They are reagents that limit the quantity of products that are formed in reactions.
From the equation of the reaction:
[tex]4Al + 3O_2 --- > 2Al_2O_3[/tex]
The mole ratio of Al to O2 is 4:3.
With 2 moles of Al and 2 moles of O2, Al becomes limiting while O2 is in excess.
With 2 moles of O2, the amount of Al required should be:
2 x 4/3 = 2.67 moles.
With 2 moles of Al, the amount of O2 required should be:
2 x 3/4 = 1.5 moles
Thus, O2 is in excess by 0.5 moles.
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In a titration of 25.0 ML of 0.40m NaOH is used to neutralize 10.0 ML of HCL. Calculate the molarity of the acid.
Answer:
=> 1.0 M
Explanation:
The question is asking us to find the molarity of the acid (HCl).
We have been provided with;
25.0 mL of 0.40 M NaOH10.0 mL of HClWe know that molarity (M) of a solution is contained in 1 L or 1000 mL or 1000 cm³.
This means that;
0.40 M is contained in 1000 mL.
X mol is contained in 25.0 mL
[tex] = \frac{25 \: \times \: 0.40}{1000} \\ = 0.01 \: moles[/tex]
These 0.01 moles is contained in 10 mL of HCl.
To find the molarity of the acid;
0.01 moles is contained in 10 mL
x mol is contained in 1000 mL
[tex]x \: mol \: = \frac{0.01 \times 1000}{10} \\ = 1.0 \: mol[/tex]
= 1.0 M
Therefore the molarity of the acid (HCl) is 1.0 M
PLEASE HELP, CANT SEEM TO FIGURE THIS OUT!
Answer:
independent: amount of baking powder
dependent: the banana bread that it produces
constants: the amount of other ingredients/the other ingredients, the type of baking powder, rest of the baking process (heat, temperature, timing of steps), and who's tasting the bread.
Explanation:
The independent variable is the thing that we are directly changing.
We usually change this to test out differences between different amounts of this variable;
This variable is the "x" variable in a function or graph, if it helps you to think of it as that.
The dependent variable is the thing that changes because of the independent variable
Once again, if you think of a graph or function, this would be the "y" variable--it changes in relation to x
The constants are the things that stay the same no matter what the changing variables are
This element is key to an experiment--an experiment would be almost pointless without it. We need to see what is actually changing as a result of the independent and intentional changes.
Here's an example:
Let's say I want to test out how much condensation forms on a bottle based on the temperature of the liquid inside.
I will be changing the temperature of the liquid inside, meaning that this is the independent variable
I will be expecting/looking for a change in the condensation because of my change in the independent variable, meaning that this is the dependent variable
In my experiment, there are some things I need to make sure don't change, so that I can see the effect of my change in the temperature directly--perhaps I need to keep the same bottle shape and size, the same amount of liquid, the same location, the same type of liquid, the same amount of time I let it sit for, etc. meaning that these are my constants.
So, with all of this in mind, let's take a look at our experiment given.
Here, I will be changing the amount of baking powder that I use, whilst observing the change in the banana bread that it directly produces.
There are a few things I must keep constant: the amount of the other ingredients, the rest of the baking process (heat/temperature, mixing time, etc.), and the type of baking powder I use
There is another consideration that I probably want to keep consistent: who is deciding the taste of the bread. If the person switches, then I might get a different opinion for the same recipe.
hope this helps! have a lovely day :)
Option 2 involves conducting an experiment to find the ideal amount of baking powder to add to a batch of banana bread.
The amount of baking powder served as the independent variable. The goal of this experiment is to determine the ideal amount of baking powder to use in each batch of banana bread.
Dependent Variable: The standard of banana bread served as the dependent variable. It is called the outcome you are measuring or observing in response to a change in the independent variable. In this instance it could be the taste, texture or texture of banana bread.
Constant: Some variables must remain constant throughout the experiment to ensure that only the independent variable has an effect on the dependent variable. Following are some possible constants in this experiment:
Banana Bread recipe except with variable amounts of baking powder.Baking time and temperature.Ingredients (such as bananas, flour, sugar, etc.) that are not baking powder.An oven for baking.By holding these variables constant, you can isolate the effect of different amounts of baking powder on the quality of the banana bread and determine the exact amount needed for best results.
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the authors imply that the response of various officials to attempts to measure their countries' carbon stock through field surveys has been
The measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.
What is an inference?An inference can be defined as an act through which a reader can deduce the meaning and message (information) that is associated with certain text in a passage, especially through induction.
In this scenario, we can infer and logically deduce that the author implied that the measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.
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Complete Question:
The authors imply that the response of various officials to attempts to
measure their countries' carbon stock through field surveys has been:
A. unhelpful, because they fear that jobs for their countries' scientists will be lost.
B. helpful, because their countries have invested significantly in technology to allow studies to expand.
C. helpful, because their countries stand to benefit from universal carbon data that the studies will uncover.
D. unhelpful, because they do not make their countries' land holdings readily available for study.
can someone help me with this?
Answer:
I see "photosynthesis" and "cellular respiration". I wonder if photosynthesis has something to do with the sun.
Explanation:
1.Tritium, of hydrogen-3, is prepared by bombarding lithium-6 with neutrons. A 0.250-mg sample of tritium decays at the rate of 8.94 x 1010 disintegrations per second. What is the decay constant (in per sec) of tritium, whose atomic mass is 3.02 amu
The decay constant (in per sec) is 1.79* 10^ -9/sec
The rate of decay is 8.94 x 1010 nuclei/s. The number of nuclei in the sample is
The rate equation is rate = kNt. Solve for k.
An exponential function has a variable exponent, a positive base, and a base that is not equal to one.
For instance, F (x) = 4x is an exponential function since the exponent is set rather than variable.
Instead of being an exponential function, f (x) = x3 is a fundamental polynomial function.
The graphs of exponential functions are continuously curved and never reach a horizontal asymptote.
Several real-world phenomena are governed by exponential or logarithmic functions.
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Increasing technology addiction among the youth write a letter to editor
Answer:
these two would help you
Explanation:
have a good day ᕕ( ᐛ )ᕗ
Select all correct statements from below. a. Recrystallization is a technique used to purify solid compounds based on solubility differences at different temperatures. b. Toluene is a clear, colorless liquid which becomes a vapor when exposed to air at room temperature. Do not breathe in. Always handle it in the fume hood. c. Filtration is a technique to separate solid from liquid(s). d. There are two different filtration techniques: Gravity Filtration and Vacuum Filtration.
All are correct statements:-
Recrystallization is a technique for purifying solid compounds. Solids tend to dissolve more in hot liquids than in cold liquids. During recrystallization, the impure solid compound is dissolved in a hot liquid until the solution is saturated, after which the liquid is cooled.
Toluene is a clear, colorless liquid that evaporates in the air at room temperature. Toluene smoke has a pungent or sweet odor, which is a sign of exposure. Toluene is typically used as a mixture with other solvents and chemicals such as paint pigments. Inhalation of small doses of toluene vapor can cause mild headaches, dizziness, drowsiness, or nausea.
Filtration is the process of separating an insoluble solid from a liquid. When filtering a mixture of sand and water: the sand remains on the filter paper (it becomes a residue). Water flows through the filter paper (it becomes a filtrate). Gravity filtration and vacuum or suction filtration are the types of filtration.
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Which ionic compound is expected to form from combining the following pairs of elements: a. Barium and fluorine b. Cesium and chlorine c. Lithium and nitrogen d. Aluminum and oxygen
An ionic compound is composed of a cation (generally, a metal ion) and an anion (a nonmetal ion). The cation and the anion combine due to the Coulombic force of attraction to form an ionic lattice. The metal atom releases one or more electrons and the nonmetal receives these electrons until they fulfill their octet.
Ionic compounds are held together by opposite charges but do not have a charge. You have to balance the +’s and -‘s. Ba has a charge of +2 F has a charge of -1 You need 2 F- to balance the +2 of Ba BaF2.
a) BaF2 or barium fluoride
b) CsCl or cesium chloride
c) Li3N or lithium nitride
d) Al2O3 or aluminum oxide
Barium And Fluorine
Please check the attached file for a detailed answer.
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You need 440 mL of a 30% alcohol solution. On hand, you have a 40% alcohol mixture. How much of the 40% alcohol mixture and pure water will you need to obtain the desired solution
110ml of the 40% alcohol mixture and pure water will need to obtain the desired solution
Given that 0.30 * 440 = 132 mL of pure alcohol needed
132 mL = 0.40 * x mL of 0.4
x = 330 mL of 70%
440 - 330 = 110 mL of H2O
Water content differs
If you have 440 mL of a 30% alcohol mixture, then (440mL)*(0.30) = 132mL of that solution is alcohol.
Similarly, if you have x mL of a 40% alcohol mixture, then (x mL)(0.40) = 0.40x mL of that solution is alcohol.
When you combine these two liquids, you will have (440 + x) mL of liquid and you want it to be 40% alcohol.
Hence 110ml of the 40% alcohol mixture and pure water will need to obtain the desired solution
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If an electron in an atom gains energy to go from a lower energy level to a higher energy level, it ______________
If an electron in an atom gains energy to go from a lower energy level to a higher energy level, it is called Excited energy state.
Ground state energy: The lowest energy state for an electron is called its ground state, which is the energy level it typically resides in. Each electron has a limit on how much energy it can have while still remaining a part of its atom. It is the most stable state of electron.
Excited state energy: An electron is in an excited state when it momentarily possesses an energy state higher than its ground state. If an electron receives additional energy, such as when it absorbs a photon, or packet, of light, or collides with an adjacent atom or particle, it can become excited. As these excited state energy level are unstable. So while coming back to ground state electrons emit radiations suitable wavelength.
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What is the IUPAC name for this compound?
Answer:
valeric acid
Explanation:
I don't know exactly. But try this one.
Answer:
IUPAC NAME: PENTANOIC ACID
COMMON NAME: VALERIC ACID
how would the equilibrium change if the temperature were increased in SO2(g)+NO2(g) --> SO3(g) +heat?
Answer:
D. The amount of nitrogen dioxide and sulfur dioxide would increase.
Explanation:
Because the reaction is exothermic, heat is a product. According to Le Chaetelier's Principle, a system in equilibrium will adjust itself so as to relieve any stress placed upon it. If the temperature of the system increases, there are more products, and therefore the system is no longer at equilibrium. Thus, it will shift to favor the reactant side of the equation, where sulfur dioxide and nitrogen dioxide are located. This makes the answer D.
Edit: Brainly thinks that the correct spelling of 'Le Chaetelier' is a bad word so that's why it is spelled wrong lol.
What is the ratio by mass of these compounds a. 2na+cl2 =2nacl? b.h2o +nao=2naoh? c.hcl+naoh=nacl+h2o?
The ratio of the mass of compounds:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl = 46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8
What is a molecular mass?
Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.
Calculation:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl
The atomic mass of Na= 23The atomic mass of Cl= 35(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)
(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)
46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH
The atomic mass of H = 1The atomic mass of O= 16Atomic mass of Na= 23(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)
(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)
2 : 16 + 23 : 16 → 46 : 32 : 2
1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O
The atomic mass of H= 1The atomic mass of Cl= 35The atomic mass of Na= 23The atomic mass of O= 16(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)
(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)
1 : 35 + 23 : 35 → 23: 35 + 2: 16
1 : 35 + 23 : 35 → 23 : 35 + 1: 8
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Sodium (Na) is a ____
HELP!!!! Will mark give 5 stars and thank!! Please!
Many types of chemical reactions include a thermochemical component
In a paragraph, compare and contrast endothermic and exothermic
reactions, including a real-world example of each type.
Answer:
An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!
Explanation:
Which is the best reason for choosing the beaker for heating the solution? the beaker is the only container that can withstand high temperatures. the beaker's wide mouth allows the thermometer to rest against the side. the beaker will not tip over when placed on the hot plate. the beaker is unbreakable.
The selection of the beaker for heating the solution:
The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".
What is a Beaker?:
A glass container with a flat bottom and a tiny pouring mouth is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids.Beakers can be heated on a hot plate directly. Because of their flat bottoms, these containers will uniformly distribute heat when the mixture is shaken. It is best to heat indirectly any other container without a flat surface.Borosilicate glass, which is frequently used to make glass beakers, has boron trioxide, which gives it the ability to withstand sharp temperature changes. It can endure temperatures of up to 400°C.
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If the molar mass of x (hco3) is 162 g/mol, determine the relative atomic mass of x.
The relative atomic mass of x is 101 u.
Molar mass is calculated by adding the atomic mass of all the elements in a compound.
Molar mass of x(HCO₃) =162 g/mol
Atomic mass of H = 1 g/mol
Atomic mass of C =12 g/mol
Atomic mass of O = 16 g/mol
Therefore, molar mass of x(HCO₃) will be
= x + 1 + 12 + 3 x 16
We know that:
x + 1 + 12 + 3 x 16=162
x + 61 = 162
x = 101 g/mol
The relative atomic mass of x will be 101 u.
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what could you do to increase the electrical force between two charged particles by a factor of 16
Increasing one charged particle by 16 will lead to increasing the electrical force between two charged particles by a factor of 16.
What is Electrical force?This is referred the attractive or repulsive interaction between any two charged bodies present.
F= kq1q2/r²
F1/F2= kq1q2/r² / 16kq1q2/r²
F1/F2 = 1/16
F2 = 16F1
This is therefore how to increase the electrical force between two charged particles by a factor of 16.
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The element oxygen has a molar mass of 15.999 grams, thus one mole of oxygen is equal to _____ g/mol.
Answer: 15.999 grams.
Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.
[tex]15.999gO*\frac{1molO}{15.999gO} =1molO[/tex]
I hope this helps! Pls mark brainliest!! :)
Please if anyone can help answer!
1.What is a solvent? give examples.
2.What is a solute? give examples.
3.What factors influence the solubility of a solute in a solvent?
Answer:
1.A solvent is a liquid in which another substance is dissolved to form a solution. Examples of solvents include water, alcohol, and vinegar.
2.A solute is a substance that is dissolved in a solvent to form a solution. Examples of solutes include salt, sugar, and caffeine.
3.Several factors can influence the solubility of a solute in a solvent, including the nature of the solute and solvent, the temperature, and the pressure.
Explanation:
Which of the following is not a type of structural isomerism? A. Functional group B. Optical C. Chain D. Positional
Answer:
B. Optical
Explanation:
First, let's go through what isomerism is. Isomerism is the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and CH3CH2OH, or in the arrangement of their atoms in space and therefore in one or more properties. There are 5 types of structural isomerism. They are chain isomerism, position isomerism, functional group isomerism, metamerism, and tautomerism. This would mean that these types of structural isomerism that are in the options would be eliminated as the question ask which of the "following" is not a type of structural isomerism. This would leave the only option available which is Option B. Optical Isomerism. So instead of being a structural isomerism, it is a type of stereoisomerism. Stereoisomerism is the arrangement of atoms in molecules whose connectivity remains the same but their arrangement in space is different in each isomer.
Therefore, the answer is Option B. Optical.
please help. i’m strugglingggg
Rewrite this measurement with a simpler unit, if possible.
Answer:
m/s
Explanation:
One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with m / s
NH4+H2O →NH3+H3O
Which one is acting weaker base?
Answer:
NH3
Explanation:
In solution, they are in equilibrium. NH4+ acts as a bronsted Lowry acid and donates an H to become NH3, and NH3 acts as a bronsted lowry base and accepts an H. In this pair, NH3 is a weak base, which gets its basic character due to the presence of lone pair of nitrogen and its ability to donate it.
When uranium ionizes and becomes u 238 5 , there are _____ protons, _____ neutrons, and _____ electrons.
The ionized uranium (238 [tex]U^{5+}[/tex]) has 92 protons, 146 neutrons and 87 electrons.
What is Uranium(238) called?The U²³⁸ is a stable isotope of Uranium. It cannot sustain a chain reaction.
The atomic number for uranium is 92 and its atomic mass is 238.
How many protons, electrons and neutrons are there?The atomic number for U²³⁸ is 92.
So, the number of protons or electrons = 92
Then, the number of neutrons = atomic mass - number of protons
⇒ 238 - 92 = 146
How many protons, electrons and neutrons are there in the ionized Uranium?The Uranium is ionized and becomes ²³⁸U⁵⁺.
So,
The number of protons = 92
The number of electrons = 92 - 5 = 87 (Since uranium is ionized by 5+ electrons i.e., removing 5 electrons)
The number of neutrons = atomic mass - number of protons
= 238 - 92 = 146
Thus, when uranium ionizes and becomes ²³⁸U⁵⁺, there are 92 protons, 146 neutrons, and 87 electrons.
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Pls answer asap i will mark u brainlistl
Answer:
X = 350 kJ/mol
Explanation:
According to the question:
Energy needed when breaking bonds + 1640 kJ/mol = Energy released when forming bonds
∴ 2 (C - C) + 8 (C - H) + 5 (O = O) + 1640 = 6(C = O) + 8(O - H)
⇒ 2 (X) + 8 (410) + 5 (500) + 1640 = 6 (740) + 8 (460)
⇒ 2X + 7420 = 8120
⇒ 2X = 700
⇒ X = 350 kJ/mol
Please help me by giving me an drawing , it’s urgent !! Or writing explanation but drawing is easier.
Answer:
13 Protons, 14 Neutrons, and 13 electrons.
Explanation:
See Picture Below
I have labeled all the numbers and the diagram.
I hope it helped
1. A sample of a gas is occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C.
If the temperature is increased to 50 °C and the pressure is increased to 2.7 atm, what is the new
volume?
The new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.
How to calculate volume?The volume of a gas can be calculated using the following formula:
P1V1//T1 = P2V2/T2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperature1.4 × 500/298 = 2.7 × V2/323
2.348 × 323 = 2.7V2
758.72 = 2.7V2
V2 = 281.009mL
Therefore, the new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.
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A 25 kg rock is placed in a graduated cylinder with water.the volume of the fluid is 18.3ml.calculate the density of the rock in g/ml
Answer:
=> 1366.120 g/mL.
Explanation:
To determine the formula to use in solving such a problem, you have to consider what you have been given.
We have;
mass (m) = 25 Kg
Volume (v) = 18.3 mL.
From our question, we are to determine the density (rho) of the rock.
The formula:
[tex]p = \frac{m}{v}[/tex]
First let's convert 25 Kg to g;
1 Kg = 1000 g
25 Kg = ?
[tex]= \frac{25 × 1000}{1}[/tex]
= 25000 g
Substitute the values into the formula:
[tex]p = \frac{25000 g}{18.3 ml}[/tex]
= 1366.120 g/mL.
Therefore, the density (rho) of the rock is 1366.120 g/mL.
Decide whether each proposed multiplication or division of measurement is possible. If it is possible, write the result in the last column of the table.
Answer:
See attached image.
Explanation:
The explanations are on the attachment. The numerical results are below.
1. 63g/7cm^3 = 9 g/cm^3
2. The m or mm must be converted so that the units are the same. 1 m = 1000 mm. I'll convert the meters to mm: 0.080 m = 80 mm.
480 mm^2/80 mm = 6 mm
3. L times L makes no physical sense, unless this is a new Star Wars technique for making dark matter. Entertaining, but useless.