Answers
The absorbance of a sample of the solution is 0.74, which is equivalent to the molar absorptivity of the Co2+(aq) solution, which is 4.48 x 10⁴ L/mol-cm.
What is moles?Moles are small, burrowing mammals found throughout much of the world. They have a cylindrical body, covered in short, velvety fur, and stocky legs. They have a rounded snout and small eyes, and their fur is usually black, brown, or gray. Moles feed mainly on earthworms, insects, and grubs, and use their powerful front paws to dig extensive tunnel systems in gardens and lawns. Moles are solitary creatures, living and foraging alone, and they are active both day and night.
This can be used to calculate the [Co2+] in the solution.
[Co2+] = Absorbance / (Molar absorptivity x Sample path length)
[Co2+] = 0.74 / (4.48 x 10^4 L/mol-cm x 0.0500 L)
[Co2+] = 0.0164 M
The number of moles of Co2+(aq) in the 50.00 mL solution can be calculated using the following equation:
Moles Co2+ = [Co2+] x Volume
Moles Co2+ = 0.0164 M x 0.050 L
Moles Co2+ = 8.20 x 10⁻³ mol Co2+
The mass percent of Co in the 0.630 g sample of the ore can be calculated using the following equation:
Mass percent Co = (Mass of Co2+ x 100) / Mass of sample
Mass percent Co = (8.20 x 10⁻³mol Co2+ x 58.93 g/mol Co2+) / 0.630 g
Mass percent Co = 5.04%
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Related Questions
need help on this one question. And explain
Answers
Answer:
14 moles
Explanation:
This is balanced equation:
BaBr2 + K2SO4 => 2KBr + BaSO4
1 mole of BaBr2 will produce 2 moles of KBr
=> 7 moles of BaBr2 will produce 7x2 = 14 moles of KBr
Beer's Law becomes nonlinear at high analyte concentrations
true or false
Answers
Answer:
True
Explanation:
Self-absorption occurs when the absorbing species in a sample interacts with other absorbing species in the same sample, leading to an overestimation of the absorbance and a deviation from the linear relationship described by Beer's Law. Therefore, at high analyte concentrations, the linear relationship breaks down and the law becomes nonlinear...
which type of reaction is shown by this equation?
Answers
The type of reaction shown in the above image is a combustion reaction (option D).
What is a combustion reaction?A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
Combustion reaction is a process wherein a fuel is combined with oxygen, usually at high temperature, releasing heat.
According to this question, methane reacts with oxygen to produce water and carbondioxide. It can be said that methane undergoes combustion.
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Which example is an biotic factor of an aquarium environment?
Answers
Answer: fish
Explanation: they are living organisms; they live in water
How many grams make up 2 moles of CH4? With equation
Answers
Answer:
32.08
Explanation:
The molar mass of CH4 (methane) is 16.04 g/mol (1 carbon atom with a molar mass of 12.01 g/mol and 4 hydrogen atoms with a molar mass of 1.008 g/mol each).
To find the number of grams in 2 moles of CH4, we can use the following equation:
mass (in grams) = number of moles × molar mass
Substituting the values, we get:
mass = 2 moles × 16.04 g/mol
mass = 32.08 g
Therefore, 2 moles of CH4 contain 32.08 grams of CH4.
2 Al + 6 HCl --> 2 AlCl3 + 3 H2
If 47.5 L of hydrogen gas is produced at STP, what mass in grams of Al was needed to react with excess HCl?
Answers
Answer:
To determine the mass of Al that was needed to produce 47.5 L of H2 gas at STP, we can use the stoichiometry of the balanced chemical equation to calculate the amount of Al required.
First, we need to convert the volume of H2 gas at STP to the corresponding amount in moles. At STP, 1 mole of gas occupies 22.4 L of volume. Therefore, 47.5 L of H2 gas is equal to 2.12 moles of H2 gas.
From the balanced chemical equation, we can see that 3 moles of H2 gas are produced for every 2 moles of Al consumed. Therefore, the amount of Al needed to produce 2.12 moles of H2 gas can be calculated as:
2.12 moles H2 x (2 moles Al / 3 moles H2) = 1.41 moles Al
Finally, we can use the molar mass of Al to convert moles of Al to its mass in grams. The molar mass of Al is 26.98 g/mol. Therefore, the mass of Al required can be calculated as:
1.41 moles Al x 26.98 g/mol = 38.1 g Al (rounded to one decimal place)
Therefore, approximately 38.1 grams of Al were needed to react with excess HCl to produce 47.5 L of H2 gas at STP.
Explanation:
In this balanced chemical equation, 2 moles of Al react with 6 moles of HCl to produce 2 moles of AlCl3 and 3 moles of H2. We are given the volume of H2 gas produced at STP and asked to calculate the mass of Al needed to react with excess HCl to produce this amount of H2 gas. To solve this problem, we used stoichiometry to relate the amount of H2 gas produced to the amount of Al required, and then used the molar mass of Al to convert from moles of Al to its mass in grams.
Hope this helps!!
If a mixture of 50% liquid water and 50% ice is at zero degrees Celsius, which of the following will change if a small amount of heat is added to the mixture? (There may be more than one correct answer.) a. A small amount (not all) of the ice will melt.
b. The ratio of liquid to solid water will increase.
c. The temperature of the mixture will increase. d. The melting point for the remaining solid ice will change.
Answers
Due to the latent heat of fusion, when a modest amount of heat is added, ice will transform into water without changing the temperature. Therefore, a portion of the ice may melt (but not all of it). The right answer is A.
What exactly is fusion?The sun and stars are both powered by fusion. Fusion is the process by which two hydrogen atoms join, or fuse, to create a helium atom. Throughout the process, a portion of both the hydrogen's energy is converted into energy.
What takes place when fusion?When multiple light nuclei combine by fusion, a heavy nucleus is produced. The process results in the production of energy because as the size of the single nucleus that forms is less than the sum of the masses of the two original nuclei. Every leftover mass is transformed into energy.
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hydrobromic acid is added to tin metal express your answer as a balanced chemical equation. identify all of the phases in your answer. if no reaction occurs, simply write noreaction.
Answers
Tin metal is mixed with hydrobromic acid, creating a metal within acid situation. Therefore, in this instance, the metal is attempting to replace the hydrogen within it. (For more detail scroll down)
Is HBr a stronger acid or HCl?The distance between the hydrogen and halogen atoms increases as the anion's size expands. It gets simpler to release H+ ions from hydracids as we move lower in the halogen group. Therefore, HI>HBr>HCl>HF is the sequence of acid strength.
Since tin is higher up, it will be able displace hydrogen from the acid to create the hydrogen gas. Tin can remove the hydrogen from the solution because it is more dense than hydrogen.
Sn(s) +2 HBr(aq) ----->SnBr2(aq) +H2(g)
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PCl5 +92.9kJ—-> PCl3+Cl2
Interpret equation to relative number of moles; is it exothermic or endothermic?
Answers
Answer:
The balanced chemical equation represents the reaction between phosphorus pentachloride (PCl5) and heat, which produces phosphorus trichloride (PCl3) and chlorine gas (Cl2):
PCl5 + heat → PCl3 + Cl2
Interpreting the equation in terms of the relative number of moles, we can see that 1 mole of PCl5 reacts to produce 1 mole of PCl3 and 1 mole of Cl2.
The given equation is exothermic because it releases heat (92.9 kJ) as a product. This can be seen by the positive sign of the heat term in the equation.
For molecules of general formula Axn (where n>2), how do you determine if a molecule is polar?
Answers
The polarity would be determined by the shape of the molecule and the arrangement of the atoms.
How do you determine the polarity of a polyatomic molecule?To determine the polarity of a polyatomic molecule, you need to consider the polarity of its individual bonds and the molecular geometry of the molecule.
The polarity of a bond is determined by the electronegativity difference between the atoms that form the bond. If the electronegativity difference is large, the bond is polar, and if it is small, the bond is nonpolar.
Once you have determined the polarity of the individual bonds, you can use the molecular geometry of the molecule to determine its overall polarity. To do this, you need to consider the arrangement of the atoms in the molecule and the direction of the polarity of each bond.
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In site-directed mutagenesis experiments, Gly is often successfully substituted for Val, but Val can rarely substitute for Gly. Explain.
Answers
In site-directed mutagenesis experiments, glycine (Gly) is often successfully substituted for valine (Val) because Gly is a smaller and more flexible amino acid.
In a mutagenesis experiment, the smaller size of Gly means it can fit into the space previously occupied by Val without causing any major changes to the protein structure. However, Val is larger and bulkier than Gly, so it is more difficult to substitute Val for Gly without causing any disruptions to the protein structure. This is why Val can rarely substitute for Gly in site-directed mutagenesis experiments.
Additionally, Gly is a nonpolar, neutral amino acid, while Val is a hydrophobic amino acid. This difference in polarity can also affect the protein structure and function, making it more difficult to substitute Val for Gly. Overall, the size, flexibility, and polarity of Gly make it a more versatile amino acid that can be successfully substituted for other amino acids, including Val, in site-directed mutagenesis experiments.
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Butylbenzene cannot be synthesized in good yield directly from benzene using a freidel-crafts alkylation. Propse an alternate synthesis of butylbenzene that does not use a freidel-crafts reaction.
Answers
Provide an alternative method for producing that does not employ a Related trades alkylation and can be done in good yields by starting with benzene.
A Craft is what?The trade of the carpenter. trades like sewing, carpentry, and ceramics; the craft of producing plays. Weaving, Quilting, Macramé, Lace-making, Knitting, and Tapestry Art.
A carpenter is what?You would be involved with the planning, chopping, and construction of furniture as a carpenter utilising various types of wood. Working on a job site, at a client's house, or in a shop are all options. They build, set up, and fix wooden furniture, doors, and window frames, among other things.
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select ruler and place next to tube 1. measure starting height of gas bubble in respirometer 1. record in lab data
Answers
Using an Hypothetical scenario, the Lab Data is given below:
Ruler Measurement for Respirometer: 1
Starting Height of Gas Bubble: 3.2 cm
What is the lab data about?In a laboratory experiment involving respirometers, it is necessary to measure the initial height of the gas bubble in each respirometer to establish a baseline for further measurements.
To do this, a ruler is used to measure the distance between the top of the gas bubble and the bottom of the respirometer tube. The measurement is recorded in the lab data as the starting height of the gas bubble in respirometer 1, which indicates the initial volume of air in the respirometer.
Therefore, This measurement is important for comparing the amount of oxygen consumed by the organism or plant being studied during the respiration process. By measuring the change in the gas bubble height over time, it is possible to calculate the rate of oxygen consumption and analyze the respiration process of the organism or plant.
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1.) How many grams of aluminum hydroxide can be produced from the
synthesis reaction of 24.3 g of aluminum oxide and 82.1 g of water?
Answers
Answer: 37.1 grams of aluminum hydroxide can be produced from the given amounts of aluminum oxide and water
Explanation:
The balanced chemical equation for the synthesis of aluminum hydroxide from aluminum oxide and water is:
Al2O3 + 3H2O -> 2Al(OH)3
From the equation, we can see that 1 mole of Al2O3 reacts with 3 moles of H2O to produce 2 moles of Al(OH)3.
We need to first calculate the number of moles of Al2O3 and H2O we have:
Number of moles of Al2O3 = mass / molar mass = 24.3 g / 101.96 g/mol = 0.238 moles
Number of moles of H2O = mass / molar mass = 82.1 g / 18.02 g/mol = 4.56 moles
From the balanced equation, we know that 1 mole of Al2O3 produces 2 moles of Al(OH)3. So, the number of moles of Al(OH)3 produced will be:
Number of moles of Al(OH)3 = (0.238 mol Al2O3) x (2 mol Al(OH)3 / 1 mol Al2O3) = 0.476 mol Al(OH)3
Finally, we can calculate the mass of Al(OH)3 produced:
Mass of Al(OH)3 = number of moles x molar mass = 0.476 mol x 78.0 g/mol = 37.1 g
Therefore, 37.1 grams of aluminum hydroxide can be produced from the given amounts of aluminum oxide and water.