The ka of propanoic acid (c2h5cooh) is 1.34 × 10-5. calculate the ph of the solution and the concentrations of c2h5cooh and c2h5coo– in a 0.193 m propanoic acid solution at equilibrium.
The pH and concentrations of C2H5COOH and C2H5COO– in a 0.193 M propanoic acid solution at equilibrium can be calculated using the given Ka and the formula for pH. The initial, change and equilibrium concentrations are used for these calculations.
Explanation:To calculate the pH and concentrations of C2H5COOH and C2H5COO– in a 0.193 M propanoic acid solution at equilibrium, we start by setting up the ICE (initial, change, equilibrium) table for the reaction. Ka = [H3O+][C2H5COO-] / [C2H5COOH], where H3O+, C2H5COO-, and C2H5COOH are equilibrium concentrations. Since the Ka for propanoic acid is given as 1.34 × 10-5, we can say that [H3O+] = sqrt(1.34 × 10-5 * 0.193).
We perform this calculation to find [H3O+], from which we find the pH = -log[H3O+]. The concentrations of C2H5COOH and C2H5COO– are both equal to 0.193 M in a 0.193 M solution of propanoic acid at equilibrium, as propanoic acid is a weak acid and partially ionizes in solution, leading to the same concentration at equilibrium.
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How many liters of carbon dioxide will be formed from the decomposition of 14.1g of calcium carbonate (at stp)?
Firstly, according to Ideal Gas Law the volume of 1 mole of a gas at Standard Temperature and Pressure (STP) is 22.4 [tex] dm^{3} [/tex], ie the value of the molar volume (Vm) is 22.4 [tex] dm^{3} [/tex]/mol.
[tex]CaCO_{3} = CaO + CO_{2} [/tex]
From the reaction, it can be seen that [tex]CaCO_{3} [/tex] and [tex]CO_{2} [/tex] have the following amount of substance relationship:
[tex]n(CaCO_{3}) = n(CO_{2}) = 1:1[/tex]
From the relationship we can determinate moles of [tex]CO_{2} [/tex] :
[tex]n(CaCO_{3}) = n(CO_{2}) = n/M= 14.1/100=0.141 moles[/tex]
Finally, we can calculate the volume of formed CO2:
V([tex]CO_{2} [/tex] )=nxVm=0.141x22.4=3.16 [tex] dm^{3} [/tex]
Explain, in detail, how you convert grams of one substance to grams of something else. Be specific and include each step
Calculate the percent composition of bromine in kBr
Final answer:
To calculate the percent composition of bromine in KBr, find the atomic mass of bromine and potassium, add them to get the formula mass of KBr, and divide the atomic mass of bromine by the total mass, then multiply by 100% to get the percentage.
Explanation:
To calculate the percent composition of bromine in KBr, you need to know the atomic masses of both potassium (K) and bromine (Br). KBr is made up of one potassium atom and one bromine atom. The atomic mass of potassium is approximately 39.10 amu (atomic mass units), and the atomic mass of bromine averages about 79.90 amu, accounting for its natural isotopic abundance.
The formula to find the percent composition is (mass of the element in one mole of the compound/mass of one mole of the compound) × 100%.
The total mass of one mole of KBr is the sum of the mass of potassium and the mass of bromine, which equals 39.10 + 79.90 = 119.00 amu. The percentage of bromine in KBr can be calculated as follows:
([tex]\frac{Mass of bromine}{Total mass of KBr}[/tex]) × 100% = ([tex]\frac{79.90 amu}{ 119.00 amu}[/tex]) × 100% ≈ 67.14%
Therefore, the percent composition of bromine in KBr is approximately 67.14%.
If you inherit half of your genes from your mother and half of your genes from your father, what percent of your genes did you inherit from each of your grandparents?
Final answer:
An individual inherits approximately 25% of their genes from each grandparent. Environmental factors and personal experiences further contribute to variations from parents. Nuclear DNA is inherited evenly from both parents, while mitochondrial DNA is solely from the mother.
Explanation:
Every individual inherits 50% of their genes from each parent. Consequently, the genes you get from your mother will include half of her genetic material, of which 50% is derived from her father (your maternal grandfather) and 50% is derived from her mother (your maternal grandmother).
The same pattern applies to your father's contribution to your genes - half from your paternal grandfather and half from your maternal grandmother. Therefore, you inherit about 25% of your genes from each grandparent.
Personal experiences and the environment play significant roles in making you different from your parents despite the genetic similarities. These factors contribute to the unique expression of your genes, resulting in individual variations in appearance, personality, and other traits.
Moreover, it's important to distinguish between nuclear DNA, which follows the 50% inheritance from each parent, and mitochondrial DNA (mtDNA), which is inherited exclusively from the mother.
What would the products of a double-replacement reaction between ca3n2 and al2o3 be?
If the Sun were much smaller than its current size, what effect would this have on eclipses?
The chemical breakdown of enormous quantities of organic material buried in the sedimentary rocks has produced ____ gas.
Answer: Methane
Explanation:
The sedimentary rocks includes enormous amounts of organic matter that is produced by the decomposition and degradation of the dead matter from plants and animals. These rocks may exhibit methane gas a valuable fossil fuel. It is a greenhouse gas. The burning of one molecule of this gas produces one molecule of carbon dioxide and two molecules of water.
An electric current can be conducted by _____. a sugar solution rubbing alcohol methane gas a salt solution
The answer is salt water.
Salt water can conduct electricity or we can say that an electric current is conducted by salt water as salt water is a good conductor of electricity when salt that is sodium chloride or NaCl is dissolved in water , positively charged sodium (Na⁺) and negatively charged chlorine(Cl⁻) molecules are set apart by the water molecule so that they can float easily and freely. We can define the conductivity of a substance as the mobility or movement of ions. So as in water, sodium and chlorine are set apart and can move freely so it become a electrolyte that can conduct electricity.
An electric current can be conducted by [tex]\boxed{\text{a salt solution}}[/tex].
Further Explanation:
Electric current:
The movement of charge carriers (electrons or protons) or ions is termed as electric current. In other words, rate of flow of electric charge through a point. SI unit of electric current is Ampere (A).
On the basis of different abilities of substances to conduct electric current, these can be classified as follows:
Conductors:
These materials allow smooth flow of charge carriers without any resistance in their movement and therefore these conduct heat and electricity.
Insulators:
These materials allow resistance to flow of electric charge carriers and therefore act as bad conductors of heat and electricity.
Semiconductors:
These allow movement of electric charge carriers under certain conditions. These have electric conductivity less than that of conductors but more than insulators.
Sugar solution cannot produce any ions in solution. Since no charge carriers are present in sugar solution, it cannot conduct electric current.
Rubbing alcohol does not contain free ions in it and therefore it cannot conduct electric current.
Methane gas is covalent in nature and does not have any free ions in it so it cannot conduct electric current.
Salt solution is nothing but solution of NaCl in water. NaCl is ionic compound so ions are present in salt solution and therefore it conducts electric current.
Therefore electric current can only be conducted by salt solution.
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Answer Details:
Grade: High School
Subject: Chemistry
Chapter: Metals and non-metals
Keywords: sugar solution, rubbing alcohol, methane gas, salt solution, electric current, electric charge carriers, conductors, insulators, semiconductors.
If the compound has a molar mass of 156 g/mol, what is its molecular formula?
The molecular formula of the compound is C10H20O.
The question is incomplete, the complete question is;
Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005-g sample of menthol is combusted, producing 0.2829 g of CO2 and 0.1159 g of H2O. What is the empirical formula for menthol? If the compound has a molar mass of 156 g/mol, what is its molecular formula?
First we have to obtain the mass/moles of each element;
Mass of C;
0.2829 g/44g/mol * 12 g/1 mol = 0.077 g of C
Number of moles of C = 0.077 g of C/ 12 g/mol = 0.0064 moles
Mass of H;
0.1159 g/18g/mol * 2g/1mol = 0.0129 g of H
Number of moles of H = 0.0129 g of H/1 g/mol = 0.0129 moles
Mass of O = 0.1005 g - (0.077 g + 0.0129 g)
Mass of O = 0.1005 g - 0.0899
= 0.0106 g
Number of moles of O = 0.0106 g/ 16 g/mol = 0.000663 moles
Dividing through by the lowest number of moles;
C - 0.0064/0.000663 H - 0.0129/0.000663 O - 0.000663/0.000663
C - 10 H - 20 O - 1
Empirical formula; C10H20O
Since the molecular formula is 156 g/mol
(C10H20O)n = 156
Where n is the number of each atom in the compound
(120 + 20 + 16)n = 156
156n = 156
n = 1
Hence the molecular formula of the compound is C10H20O.
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Suppose you want to make 100 grams of water, what is the molar mass of water
Minerals are grouped into mineral classes primarily on a basis of _____. the number of cleavage directions present chemistry, specifically the cations within the chemical formula chemistry, specifically the anions within the chemical formula hardness; hard, soft, and medium are the three primary classes
In an exothermic reaction, energy may be released to the surroundings in the form of
Explanation:
A reaction in which energy is released in the form of heat is known as exothermic reaction.
General reaction equation for exothermic reaction is as follows.
[tex]Reactants \rightarrow Products + Energy[/tex]
For example, lightening a candle is an exothermic reaction.
Thus, we can conclude that in an exothermic reaction, energy may be released to the surroundings in the form of heat.
The atoms and molecules in a liquid are in constant motion. As temperature decreases, what is true of the particles in the liquid? the rate of particle movement decreases the distance between the particles increases the attraction between the particles decreases the potential energy of the particles increases
a) The rate of particle movement decreases as temperature decreases, causing the atoms and molecules in the liquid to move less energetically.
The atoms and molecules in a liquid are in constant motion. As temperature decreases, the kinetic energy of these particles decreases as well.
This is because temperature is directly related to the average kinetic energy of the particles in a substance. Therefore, as the temperature drops, the particles move more slowly.
Here's a step-by-step explanation:
The decrease in the temperature of a liquid leads to a reduction in the thermal energy provided to the particles.
Kinetic energy, the energy of motion, is directly proportional to temperature, which measures the average kinetic energy of particles, indicating a decrease in temperature.
Particles' movement decreases with less kinetic energy, resulting in slower and slower particles.
The distance between particles may decrease due to stronger attractive forces at lower kinetic energies, but option b (distance increases) is incorrect as particles come closer together as they lose energy.
The attraction between particles decreases with decreased kinetic energy, causing them to pull closer together, contradicting option c.
Particles' potential energy decreases as they move closer in a stable configuration at lower temperatures.
Correct Question:
The atoms and molecules in a liquid are in constant motion. As temperature decreases, what is true of the particles in the liquid?
a) the rate of particle movement decreases
b) the distance between the particles increases
c) the attraction between the particles decreases
d) the potential energy of the particles increases
A certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object?
Calculate the volume of 76.2 mole of propane gas,C3H8, if the molar volume is 55.0L/mol.
Which is part of the hydrosphere? lightning plants clouds squirrels
What PROPERTIES of elements visibly show periodic trends when their values are graphed?
Final answer:
Properties of elements that visibly show periodic trends when their values are graphed include atomic size, ionization energy, and electron affinity.
Explanation:
The properties of elements that visibly show periodic trends when their values are graphed include atomic size, ionization energy, and electron affinity.
Atomic size, or atomic radius, generally increases as you move down a group (vertical column) in the periodic table. This is because additional energy levels or electron shells are added as you move down, resulting in larger atomic size.
On the other hand, ionization energy, which is the energy required to remove an electron from an atom, generally increases as you move across a period (horizontal row) from left to right in the periodic table. This is because the atomic size decreases and the attraction between the positively charged nucleus and the negatively charged electron increases, making it more difficult to remove an electron.
Lastly, electron affinity, which is the energy change when an atom gains an electron, also shows periodic trends. Electron affinity generally becomes more negative (increases) as you move across a period from left to right, except for a few exceptions. This is because atoms on the right side of the periodic table have a higher effective nuclear charge, which makes it easier for them to attract and gain electrons.
A reaction requires 22.4l of at stp. You have 32.0l of gas at 398k and 105.6 kpa. Will you have enough gas to carry out the reaction? True or false
To determine if you have enough gas to carry out a reaction, compare the gas volume at the given conditions to 22.4L at STP.
Whether you have enough gas to carry out the reaction can be determined by comparing the known volume at STP to the volume you have at the given conditions of 398K and 105.6 kPa.
If you have 32.0L of gas at 398K and 105.6 kPa, you need to calculate the volume that gas would occupy at STP using the ideal gas law and compare it to 22.4L, which is the volume needed for the reaction at STP.
If the volume at STP is greater than 22.4L, then you have enough gas to carry out the reaction. Otherwise, you do not have sufficient gas volume.
Which of the following describes a saturated solution?
A. One containing 1 g of sugar in 100 mL of water.
B. One that contains as much solute as it can hold at a given temperature.
C. One that contains less solute than it can hold at 25oC.
D. One in which the ratio of solute to solvent is small.
E. One that is equivalent to a supersaturated solution.that is equivalent to a supersaturated solution.
Final answer:
The correct answer is B. One that contains as much solute as it can hold at a given temperature. This is because a saturated solution is exactly that; it has reached its solubility limit for solute at a specific temperature and cannot dissolve any more of that solute.
Explanation:
A saturated solution is one in which the maximum amount of solute that can be dissolved by the solvent at a given temperature has been reached. If no more solute can be dissolved at that temperature, the solution has reached its solubility limit. This is in contrast to an unsaturated solution, where less solute is dissolved than the solvent can hold at that temperature. Furthermore, a supersaturated solution contains more solute than the normal solubility limit due to special circumstances, such as being carefully cooled after being heated to dissolve the extra solute, but this is not a stable state.
Considering the options provided:
A. This is an example of a solution but does not specify if it is saturated or not.B. One that contains as much solute as it can hold at a given temperature. This is the correct definition of a saturated solution.C. This describes an unsaturated solution.D. This statement is about dilution, which does not indicate saturation.E. A supersaturated solution is different from a saturated solution as it contains more solute than what is normally possible at a given temperature.What is the IMA of the inclined plane shown?
6
3
6.75 (not the answer)
Answer:
[tex]IMA = 3[/tex]
Explanation:
The ideal mechanical advantage of the inclined plane is:
[tex]IMA = \frac{L}{h}[/tex]
[tex]IMA = \frac{4.5\,m}{1.5\,m}[/tex]
[tex]IMA = 3[/tex]
2. This graph can best be described as a
a. Bar graph
b. Exponential graph
c. Logistic growth graph
d. Line graph
Pseudoephedrine elixir contains 30 milligrams per teaspoon. The daily retail sales limit for pseudoephedrine is 3.6 grams. How many ounces of elixir is equivalent to 3.6 grams?
Answer:
Explanation:
Pseudoephedrine elixir contains 30 milligrams per teaspoon. The daily retail sales limit for pseudoephedrine is 3.6 grams. How many ounces of elixir is equivalent to 3.6 grams?
convert 3.6 grams to milligrams
3.6*1000
3600milligrams
but
30mg=1 teaspoon
3600mg=x teaspoon
120 teaspoon
but 1ounce=6 teaspoon
x=120 teaspoon
x=20 ounce
Therefore the daily limit of Pseudoephedrine elixir will be 20 Ounce
The rate constant is found to be 3.9 x 10-5 M-1 s-1. Calculate the rate of formation of ozone when the concentration of oxygen atoms is 3.0 x 10-14 molar and the concentration of diatomic oxygen is 1.3 x 10-14 molar.
Scientists' evidence for an expanding universe is called a (blueshift, yellowshift, redshift, greenshift) because the light waves emitted by stars and galaxies are shifting toward the (yellow, blue, green, red) end of the visible color spectrum.
Answer: Expansion of universe is called the red shift and the light emitted by stars and galaxies is red light.
Explanation: As the universe is expanding, the relative distance is increasing from the Earth, hence causing an increase in the wavelength.
Red shift occurs when there is increase in wavelength. Hence, the light will shift towards the red end of the visible light.
The stars and galaxies are also farther away from the Earth, hence they also have a larger wavelength and will shift the light to the red end of the visible spectra.
By what factor does [h+ ] change for each ph change? (a) 3.20 units
Final answer:
The hydrogen ion concentration [H+] changes by a factor of 10 for each unit change in pH. Therefore, a pH change of 3.20 units results in a 10^3.20 (approximately 1,585-fold) change in [H+].
Explanation:
The pH scale is a logarithmic scale used to measure the acidity or basicity of an aqueous solution. The pH value is calculated by taking the negative logarithm of the hydrogen ion concentration ([H+]). For each unit change in pH, the hydrogen ion concentration changes by a factor of 10.
When considering a pH change of 3.20 units, you calculate the change in hydrogen ion concentration by raising 10 to the power of the pH change. Therefore, for each pH change of 1 unit, the [H+] changes by a factor of 10. Hence, for a change of 3.20 units:
A change of 1 unit corresponds to a 10-fold change in [H+].A change of 2 units corresponds to a 102 or 100-fold change in [H+].A change of 3 units corresponds to a 103 or 1,000-fold change in [H+].A change of 3.20 units corresponds to a 103.20 or approximately 1,585-fold change in [H+].For each pH change of 3.20 units, the [H⁺] concentration changes by a factor of approximately 1584.89.
A change of one unit on the pH scale represents a change in the [H⁺] concentration by a factor of 10. Consequently, a change of two units represents a change in the [H⁺] concentration by a factor of 100. For a change of 3.20 units, the factor is 103.20.
Calculating this, we get:
103.20 = 1584.89
Therefore, the [H⁺] concentration changes by a factor of approximately 1584.89 for a pH change of 3.20 units.
The reaction that takes place when iron metal combines with aqueous hydrochloric acid.
Carbonyl fluoride, cof2, is an important intermediate used in the production of fluorine-containing compounds. for instance, it is used to make the refrigerant carbon tetrafluoride, cf4 via the reaction 2cof2(g)⇌co2(g)+cf4(g), kc=8.90 if only cof2 is present initially at a concentration of 2.00 m, what concentration of cof2 remains at equilibrium?
Final answer:
To find the equilibrium concentration of COF2, we use the equilibrium constant Kc = 8.90 and set up a quadratic equation based on the initial concentration of COF2. Solving this gives us the concentration of COF2 remaining at equilibrium, which is approximately 1.58 M.
Explanation:
Equilibrium Calculation for Carbonyl Fluoride Reaction
To determine the concentration of COF2 that remains at equilibrium, we'll use the equilibrium constant and the initial concentration. The chemical equilibrium reaction is:
2COF2(g) ⇌ CO2(g) + CF4(g)
The equilibrium constant (Kc) for this reaction is 8.90. If only COF2 is present initially at a concentration of 2.00 M, let's define the change in concentration for COF2 at equilibrium as 'x'. This means at equilibrium, the concentration of COF2 will be (2.00 - 2x), and the concentrations of CO2 and CF4 will both be 'x' because they are produced in a 1:1 ratio.
The equilibrium expression is:
Kc = [CO2][CF4] / [COF2]2
Substituting the known values and expressions for equilibrium concentrations, we get:
8.90 = (x)(x) / (2.00 - 2x)2
This is a quadratic equation in the form of ax2 + bx + c = 0. By solving this quadratic equation, we can find the value of 'x' and therefore the equilibrium concentration of COF2. After calculation, the concentration of COF2 remaining at equilibrium is approximately 1.58 M.
In the Lewis dot structure for NH3, the central atom of the molecule has three atoms bonded to it and one lone pair of electrons. mc006-1.jpg The shape of an NH3 molecule is
Answer:
Trigonal pyramidal
Explanation:
Edge
What mass of ammonia, NH3, is necessary to react with 2.1x10^24 molecules of oxygen in the following reaction?
4NH3(g)+7O2(g)+4NO2(g)
Final answer:
Approximately 1.998 moles of NH3 are required to react with 2.1x10^24 molecules of O2.
Explanation:
The balanced chemical equation for the reaction is:
4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g)
From the equation, we can see that 4 moles of NH3 react with 7 moles of O2. Therefore, in order to find the mass of NH3 required to react with 2.1x10^24 molecules of O2, we need to convert the number of O2 molecules to moles and then use the mole ratio to calculate the moles of NH3 required.
Step 1: Convert 2.1x10^24 O2 molecules to moles:
Moles of O2 = (2.1x10^24 molecules) / (6.022x10^23 molecules/mol) = 3.49 moles O2
Step 2: Use the mole ratio from the balanced equation to find the moles of NH3 required:
4 moles NH3 / 7 moles O2 = (3.49 moles O2) * (4/7) = 1.998 moles NH3
Therefore, approximately 1.998 moles of NH3 are required to react with 2.1x10^24 molecules of O2.