Home
Ask directory
Chemistry 102
September 2023
18
Chemistry 102
Q&A Archive of
September 18, 2023
Select Question
September 18 of 2023
please solve thid for me snd explain how it was done
Potassium bromide has a solubility of 67.8 g/100 g of water at 25°C. How many grams of water are needed to dissolve 0.409 mol of KBr at 25°C? (Enter in standard notation, with one digit after the decimal point)
Based on the table below which gas is most soluble in liquid H2O? CO2 N2 O2 Xe
At a particular temperature, suppose that 23.5 g solute is added to 50.0 g water and, after mixing, 4.6 g of the solute remains undissolved. What is the solubility of this solute at this temperature in grams per 100 g of water? (Enter in standard notation with one digit after the decimal…
Which statement best describes why the enthalpy of mix (TRIANGLEHmix) is always exothermic? The (TRIANGLEHmix) is always exothermic because it describes the energy …. A. … released when IMF form between solute and solvent. B. … released when IMF break between solute and solvent. C. ……
F2 will have a higher melting point than Ne. true or false?
As the polarity of a covalent compound increases, the solubility of the compound in water increases. true or false?
A can of club soda is a carbonated drink which contains dissolved sodium bicarbonate (NaHCO3). Identify the strongest intermolecular force for each item. 1. H2O, is it dipole-dipole, covalent bonds, electrostatic attraction in ionic bonds, dispersion forces, ion-dipole, hydrogen bonding? 2.…
why is it that nf3 has no good donor properties but pf3 forms many complexes with metals? give examples of such complexes.
LiF will have a higher vapor pressure at 25oC than H2S. true or false?
How many grams of sodium iodide are needed to remove 2.1 mg of O3 ?
N2 will have a higher boiling point than NO. true or false?
H2O will have a lower vapor pressure at -50oC than F2. true or false?
Consider a 355 mL can of seltzer, which is the same as club soda but contains pure water with dissolved carbon dioxide, in comparison to the 355 mL can of club soda which contains sodium bicarbonate. If a club soda can contains 0.448 moles of sodium bicarbonate, what is the boiling point?…
A can of club soda is a carbonated drink which contains dissolved sodium bicarbonate (NaHCO3). Identify all solutes in the system A. H2O B. CO2 C. NaHCO3
Consider a 355 mL can of seltzer, which is the same as club soda but contains pure water with dissolved carbon dioxide, in comparison to the 355 mL can of club soda which contains sodium bicarbonate. If a club soda can contains 0.547 moles of sodium bicarbonate, what is the freezing point?…
Rank the following compounds in order of lowest to highest boiling point, Ne Xe Ar Kr
The solubility of oxygen gas in water in 0.00412 g/100 g water at 20°C and 1.00 atm. What is the mass of oxygen gas dissolved in 100 g at 20°C and 0.510 atm? Assume the density of water is 1 g/mL. (Enter in standard notation with 5 digits after the decimal place)
A 355 mL can of club soda contains 833.7 ppm sodium bicarbonate (NaHCO3). What is the mole percent of sodium in the solution? (enter 4 digits after the decimal place)
The pressure of CO2 above the liquid in the can is 1,378 mmHg. What is the concentration of CO2 dissolved in the club soda before opening the bottle? kH is 3.4x10-2 M/atm (enter 4 digits after the decimal point)
Select the solute that is likely most soluble in hexane, C6H14. A. H2O B. NH3 C. CuCl2 D. S8 E. NaCl
What is the strongest type of intermolecular force in XeCl2
What is the strongest type of intermolecular force in CH3CH2NH2
Consider a 355 mL can of seltzer, which is the same as club soda but contains pure water with dissolved carbon dioxide, in comparison to the 355 mL can of club soda which contains sodium bicarbonate. If a club soda can contains 0.540 moles of sodium bicarbonate, what is the vapor…
Select the false statement. A. The boiling point of a solution depends on the identity of the solute particles. B. When a solid is added to a liquid, the vapor pressure decreases. C. Osmotic pressure is a colligative property. D. Freezing-point depression occurs in solutions due to entropy…
When partial pressure of a gas above a solution increases, the solubility of the gas ________ in solution A. is constant B. increases C. decreases D. not enough information
There are twelve σ bonds in this molecule. True or false?
The C-N bond is formed from overlap of an sp2 hybrid orbital from the carbon atom with an sp3 hybrid orbital from the nitrogen atom. true or false?
fill in the blank
Falch and Gaden studied the flow characteristics of a continuous, multistage fermentor by injecting an impulse of dye to the reactor [E. A. Falch and E. L. Gaden, Jr., Biotech. Bioengr., 12 (1970) 465]. Given the following RTD data from four-stage fermentor, calcule the Pe
Iron (III) Nitrate 1) Which metal is present in Iron (III) Nitrate? 2) Which metals are absent?
Fill in the blank
Balanced Equations for Barium Nitrate +Sodium Chloride with Nitric Acid Balanced Equations for Barium Nitrate +Sodium Hydroxide with Nitric Acid Balanced Equations for Calcium Nitrate +Sodium Chloride with Nitric Acid Balanced Equations for Calcium Nitrate +Sulfuric Acid with Nitric…
Balanced Equations for Barium Nitrate with Nitric Acid Balanced Equations for Calcium Nitrate with Nitric Acid Balanced Equation for Iron (III) Nitrate with Nitric Acid Balanced Equation for Silver Nitrate with Nitric Acid
Balanced equation for Barium Nitrate and Ammonium chloride Balanced equation for Barium Nitrate and Sodium Chloride Balanced equation for Barium Nitrate and Sodium Hydroxide Balanced equation for Barium Nitrate and Sulfuric Acid Balanced equation for Calcium Nitrate and Ammonium…
Fill in the blank
Explain briefly why is important to conduct HAZOP study for a chemical process and conduct a HAZOP study for a generic reactor operating at 700 K, 20 bar having an inlet flow rate of 10 Liters per minute.
Which of the following has nonpolar bonds? HCl Br2 H2S OF2 All are nonpolar
Which of the following has only nonpolar covalent bonds? CCl4 N2 CO NaCl HI
Which of the following contains only nonpolar bonds? CH4 Mg3N2 HCl H2O Cl2
The Lewis structure for which of the following contains the greatest number of lone pairs of electrons? H2O F2 CH4 H2
Which of the following has a double bond? CN- C2H2 C2H4 H2O
The total number of valence electrons that must be shown in the dot formula for the C4H5Cl2FO molecule is _____.
Most molecules obey the octet rule. However, only ___________ in the list below obeys the octet rule. I. BH3 II. PCl5 III. SF6 IV. O3
What is the correct order of the following bonds in terms of decreasing polarity? As-Cl, P-Cl, N-Cl N-Cl, P-Cl, As-Cl P-Cl, N-Cl, As-Cl As-Cl, N-Cl, P-Cl
Of the following elements, which one forms cations with varying positive charges? carbon, C boron, B copper, Cu calcium, Ca
Which of the following is most likely to lose electrons when forming an ion? S P N Rh F
prove that the momentum operator is a hermitian operator but the product of position and momentum operator is not a hermitian operator
Both dithiothreitol and dithioerythritol have the formula C4H10O2S2. The two end carbons of these compounds are thiolmethyl groups, and two middle carbons of these compounds are hydroxymethylene groups. How many stereoisomers are possible for these compounds? answer choices: 3, 6, 2, 8, or 4
NiSO4.6H2O + (NH4)2SO4 → NiSO4(NH4)2SO4.6H2O what is theoretical yield
1.5 A simultaneous determination for two enzymes lipase and protease in a solution of a pharmaceutical drug were determined using spectroscopy. Molar absorptivities corresponding to their absorption maxima are as follows: Protease Lipase 365 nm 10.2 3529 Molar absorptivity, € 700…
The vapor pressure of a solution containing 8.12 g of a nonvolatile, nonelectrolyte solute (C21H42O) in 80.64 g of solvent A(MW=78 g/mol) is 684 torr at 20 Celsius . What is the vapor pressure of pure solvent A 20 Celsius?
A 0.780 M acetic acid, CH3COOH solution has a density 1.01 g/mL. How many grams of solvent are present in a 125 mL of this solution?/
Two isomers ( \( A \) and 11 ) of a gives compound dimwrize as follows: \[ \begin{array}{l} 2 \mathrm{~A} \stackrel{\leftrightarrow}{\longrightarrow} \mathrm{A}_{2} \\ 2 \mathrm{~B} \stackrel{4}{\longrightarrow} \mathrm{B}_{3} \end{array} \] Both processes are knowe to be scoosd order in…
Determine the CO2 released by mixing 0.43g of CaCo3 with 50 mL H2SO4. The final mass is 2.7617.
The structure of cesium metal at 25°C and 1 atm is body-centered cubic. At the same temperature but at high pressure, Cs undergoes a phase transition to yield a structural much denser than body-centered cubic. Which of the following is likely the structure of Cs at high pressure? A.…
What is the geometry assumed by [Fe(NH3)Cl3] if it is found to have 5.92 Bohr magnetons? A. octahedral B. tetrahedral C. square planar D. linear
According to the 18 electron rule/ which of the following is not a correct formula for a stable metal carbonyl? A. [Mn(CO)5]- B. [Fe(CO)4]2- C. [Co(CO)4]+ D. [Ni(CO)4]
What is the CSFE in the compound [Cr(OH2)6]3+? A. 0 B. -0.4 C. -1.2 D. -1.6
Consider the reaction H2(g) + I2(g) ïƒ 2HI(g).Into a 1.00 L vessel, 1.00 mol H2(g) and 1.00 mol I2(g) are placed at a high temperature. When the reaction mixture stops changing, it is found that 79.0% of the H2(g) has reacted. What is the equilibrium constant for this reaction at this…
A 2.0 kg block hung from a vertical spring causes it to stretch by 20.0 cm. If the 2.0 kg block is replaced by a 0.50 kg mass, and the spring is stretched and released, what is the frequency of the oscillation? A. 4.2 Hz B. 3.7 Hz C. 2.2 Hz D. 6.7 Hz
A 2.0 kg block hung from a vertical spring causes it to stretch by 20.0 cm. If the 2.0 kg block is replaced by a 0.50 kg mass, and the spring is stretched and released, what is the frequency of the oscillation? A. 4.2 Hz B. 3.7 Hz C. 2.2 Hz D. 6.7 Hz
What is the net ionic equation of aqueous cesium iodide plus and aqueous solution of bromine?
A 0.204 g of sample of a nonvolatile solid solute dissolved in 10.00 g of cyclohexane. The change in freezing point is 3.00˚C. (kf,cyclohexan = 20.0°C•kg/mol) (a) The amount of solute present in the solution is Blank 1 mol. (b) The molar mass of the solute is Blank 2 g/mol. (Pay…
Formula for limiting reagent
What is the reaction quotient Q?
0.43 g mixture of CaCO3*MgCO3 is mixed with 50mL H2SO4 and put in centrifuge for some time. The mass of the product is 2.7617g Determin the mass percent and percent composition of the mixture and the carbonate. Then determine the percent yield and error.
How many formula units of SrCl2 are in 5.70 x 10-2 grams SrCl2?
Magnesium has 3 isotopes. Using the following information, calculate the atomic mass. You need to show some work.
How many kL (kiloliter) are in 10.75 cups?
How many nm (nanometer) are in 3.969 x 10-3 dm (decimeters)?
A compound with the formula TeBrn has a formula mass of 447.22 amu. What is the value for "n in the formula TeBrn?
In which of the following molecules requires a coordinate covalent bond to explain the stability?
Calculate the percent composition of carbonate. The mixture is CaCO3/MgCO3 and the acid is H2SO4. Then calculate the percent yield and percent error.
\( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1} \)
Potassium bromide has a solubility of 67.8 g/100 g of water at 25°C. How many grams of water are needed to dissolve 0.409 mol of KBr at 25°C? (Enter in standard notation, with one digit after the decimal point)
Based on the table below which gas is most soluble in liquid H2O? CO2 N2 O2 Xe
At a particular temperature, suppose that 23.5 g solute is added to 50.0 g water and, after mixing, 4.6 g of the solute remains undissolved. What is the solubility of this solute at this temperature in grams per 100 g of water? (Enter in standard notation with one digit after the decimal…
Which statement best describes why the enthalpy of mix (TRIANGLEHmix) is always exothermic? The (TRIANGLEHmix) is always exothermic because it describes the energy …. A. … released when IMF form between solute and solvent. B. … released when IMF break between solute and solvent. C. ……
F2 will have a higher melting point than Ne. true or false?
As the polarity of a covalent compound increases, the solubility of the compound in water increases. true or false?
LiF will have a higher vapor pressure at 25oC than H2S. true or false?
How many grams of sodium iodide are needed to remove 2.1 mg of O3 ?
N2 will have a higher boiling point than NO. true or false?
H2O will have a lower vapor pressure at -50oC than F2. true or false?
Consider a 355 mL can of seltzer, which is the same as club soda but contains pure water with dissolved carbon dioxide, in comparison to the 355 mL can of club soda which contains sodium bicarbonate. If a club soda can contains 0.448 moles of sodium bicarbonate, what is the boiling point?…
A can of club soda is a carbonated drink which contains dissolved sodium bicarbonate (NaHCO3). Identify all solutes in the system A. H2O B. CO2 C. NaHCO3
Consider a 355 mL can of seltzer, which is the same as club soda but contains pure water with dissolved carbon dioxide, in comparison to the 355 mL can of club soda which contains sodium bicarbonate. If a club soda can contains 0.547 moles of sodium bicarbonate, what is the freezing point?…
Rank the following compounds in order of lowest to highest boiling point, Ne Xe Ar Kr
The solubility of oxygen gas in water in 0.00412 g/100 g water at 20°C and 1.00 atm. What is the mass of oxygen gas dissolved in 100 g at 20°C and 0.510 atm? Assume the density of water is 1 g/mL. (Enter in standard notation with 5 digits after the decimal place)
The pressure of CO2 above the liquid in the can is 1,378 mmHg. What is the concentration of CO2 dissolved in the club soda before opening the bottle? kH is 3.4x10-2 M/atm (enter 4 digits after the decimal point)
Select the solute that is likely most soluble in hexane, C6H14. A. H2O B. NH3 C. CuCl2 D. S8 E. NaCl
What is the strongest type of intermolecular force in XeCl2
What is the strongest type of intermolecular force in CH3CH2NH2
Select the false statement. A. The boiling point of a solution depends on the identity of the solute particles. B. When a solid is added to a liquid, the vapor pressure decreases. C. Osmotic pressure is a colligative property. D. Freezing-point depression occurs in solutions due to entropy…
When partial pressure of a gas above a solution increases, the solubility of the gas ________ in solution A. is constant B. increases C. decreases D. not enough information
There are twelve σ bonds in this molecule. True or false?
The C-N bond is formed from overlap of an sp2 hybrid orbital from the carbon atom with an sp3 hybrid orbital from the nitrogen atom. true or false?
Iron (III) Nitrate 1) Which metal is present in Iron (III) Nitrate? 2) Which metals are absent?
Balanced Equations for Barium Nitrate with Nitric Acid Balanced Equations for Calcium Nitrate with Nitric Acid Balanced Equation for Iron (III) Nitrate with Nitric Acid Balanced Equation for Silver Nitrate with Nitric Acid
Fill in the blank
Which of the following has nonpolar bonds? HCl Br2 H2S OF2 All are nonpolar
Which of the following has only nonpolar covalent bonds? CCl4 N2 CO NaCl HI
Which of the following contains only nonpolar bonds? CH4 Mg3N2 HCl H2O Cl2
The Lewis structure for which of the following contains the greatest number of lone pairs of electrons? H2O F2 CH4 H2
Which of the following has a double bond? CN- C2H2 C2H4 H2O
The total number of valence electrons that must be shown in the dot formula for the C4H5Cl2FO molecule is _____.
Most molecules obey the octet rule. However, only ___________ in the list below obeys the octet rule. I. BH3 II. PCl5 III. SF6 IV. O3
What is the correct order of the following bonds in terms of decreasing polarity? As-Cl, P-Cl, N-Cl N-Cl, P-Cl, As-Cl P-Cl, N-Cl, As-Cl As-Cl, N-Cl, P-Cl
Of the following elements, which one forms cations with varying positive charges? carbon, C boron, B copper, Cu calcium, Ca
Which of the following is most likely to lose electrons when forming an ion? S P N Rh F
What is the geometry assumed by [Fe(NH3)Cl3] if it is found to have 5.92 Bohr magnetons? A. octahedral B. tetrahedral C. square planar D. linear
What is the CSFE in the compound [Cr(OH2)6]3+? A. 0 B. -0.4 C. -1.2 D. -1.6
Consider the reaction H2(g) + I2(g) ïƒ 2HI(g).Into a 1.00 L vessel, 1.00 mol H2(g) and 1.00 mol I2(g) are placed at a high temperature. When the reaction mixture stops changing, it is found that 79.0% of the H2(g) has reacted. What is the equilibrium constant for this reaction at this…
What is the net ionic equation of aqueous cesium iodide plus and aqueous solution of bromine?
A 0.204 g of sample of a nonvolatile solid solute dissolved in 10.00 g of cyclohexane. The change in freezing point is 3.00˚C. (kf,cyclohexan = 20.0°C•kg/mol) (a) The amount of solute present in the solution is Blank 1 mol. (b) The molar mass of the solute is Blank 2 g/mol. (Pay…
What is the reaction quotient Q?
How many formula units of SrCl2 are in 5.70 x 10-2 grams SrCl2?
Magnesium has 3 isotopes. Using the following information, calculate the atomic mass. You need to show some work.
How many kL (kiloliter) are in 10.75 cups?
How many nm (nanometer) are in 3.969 x 10-3 dm (decimeters)?
A compound with the formula TeBrn has a formula mass of 447.22 amu. What is the value for "n in the formula TeBrn?