Recent questions without an upvoted answer

0 votes

1 answer 94 views

A chemistry student added 2 grams of sodium hydroxide to 50 ml of hydrochloric acid with a concentration of 0.5 M. After the reaction was complete, the student collected 1.5 grams of sodium chloride. Calculate the percent yield of sodium chloride.

asked Jan 22 in Chemical reactions by ChristelZ81 (2.4k points)

0 votes

1 answer 95 views

A chemistry laboratory is provided with a 10 mL solution containing a mixture of sodium chloride and potassium chloride. After adding an excess of silver nitrate, it has been observed that 0.476 grams of AgCl precipitate out. Determine the mass of each component (NaCl and KCl) in the original solution using mass balance calculations.

asked Jan 22 in Analytical Chemistry by ChanteStroh (2.5k points)

0 votes

1 answer 54 views

A chemistry lab has 20 grams of magnesium and 30 grams of hydrochloric acid. What is the exact amount (in grams) of magnesium chloride that will be produced in a complete reaction between magnesium and hydrochloric acid?

asked Jan 22 in Chemical reactions by Precious09K0 (2.8k points)

0 votes

1 answer 58 views

A chemistry experiment was conducted to determine the rate constant for the reaction between hydrogen peroxide and iodide ion in acidic medium. The initial concentrations of hydrogen peroxide and iodide ion were 0.2 M and 0.1 M respectively. The reaction was carried out at 25°C and the time taken for the completion of the reaction was 60 seconds. Based on these data, what is the rate constant for the reaction?

asked Jan 22 in Chemical kinetics by MoniqueBrins (2.1k points)

0 votes

1 answer 83 views

A chemistry experiment involves burning a sample of propane gas, C3H8, and measuring the heat released. If 2.00 grams of propane is burned completely to produce CO2(g) and H2O(l), and the heat of combustion is found to be -2044 kJ/mol, what is the heat released in kJ when 2.00 grams of propane is burned?

asked Jan 22 in ThermoChemistry by PercyEdmonds (2.4k points)

0 votes

1 answer 63 views

A chemist wants to produce 5 grams of ammonia (NH3) gas through the reaction of nitrogen gas (N2) and hydrogen gas (H2). What mass of hydrogen gas is needed, assuming excess nitrogen gas is provided? (Hint: balance the chemical equation and use stoichiometry to calculate the required mass)

asked Jan 22 in Chemical reactions by KyleSchlemme (2.6k points)

0 votes

1 answer 67 views

A chemist performed a reaction that was supposed to produce 25 grams of the desired product. However, upon measuring the amount of product produced, it was found that only 18 grams were obtained. Calculate the percent yield of the reaction.

asked Jan 22 in Chemical reactions by NadineKzd354 (2.3k points)

0 votes

1 answer 74 views

A chemist mixes 0.1 mol of hydrogen (H2) with 0.2 mol of nitrogen (N2) in a 2 L flask at 400°C. The reaction H2(g) + N2(g) ⇌ 2NH3(g) establishes equilibrium. Calculate the equilibrium concentrations of hydrogen, nitrogen, and ammonia if the Kc value of the reaction at this temperature is 1.5 x 10^-2.

asked Jan 22 in Chemical equilibrium by Ashleigh66X2 (2.6k points)

0 votes

1 answer 73 views

A chemist is attempting to electroplate copper onto a steel surface using a copper sulfate solution. The standard reduction potential for this reaction is -0.34 V, but the scientist is only seeing a voltage of -0.53 V. Calculate the overpotential for this electrochemical reaction.

asked Jan 22 in ElectroChemistry by ShanicePeele (2.9k points)

0 votes

1 answer 73 views

A chemist has a sample of an unknown compound with a mass of 5.00 g. After analyzing the sample, the following results were obtained: 0.50 g of oxygen, 1.25 g of carbon, and 3.25 g of hydrogen. Calculate the molecular formula of the unknown compound using mass balance calculations.

asked Jan 22 in Analytical Chemistry by Chantal75798 (1.7k points)

0 votes

1 answer 61 views

A chemist analyzed a sample of unknown substance and found that it contains 55% carbon, 9.17% of hydrogen and the rest of the mass is oxygen. What is the percentage by mass of oxygen in the sample?

asked Jan 22 in Analytical Chemistry by MarilynnAnth (2.2k points)

0 votes

1 answer 52 views

A chemical reaction was carried out at constant temperature and pressure. The initial concentration of the reactants and products were known. After a certain amount of time, the concentration of the reactants and products were measured. Using non-equilibrium thermodynamics, calculate the magnitude and sign of the entropy change of the system during the reaction.

asked Jan 22 in Physical Chemistry by AnnettaCampb (2.6k points)

0 votes

1 answer 70 views

A chemical reaction of N2O4(g) ⇌ 2NO2(g) is established in a closed vessel at a certain temperature. The initial concentration of N2O4 is 0.1M. At equilibrium, the concentration of NO2 is found to be 0.6M. Calculate the equilibrium concentration of N2O4.

asked Jan 22 in Chemical equilibrium by MckenzieWxs (1.9k points)

0 votes

1 answer 64 views

A chemical reaction is taking place where nitrogen gas and hydrogen gas are being combined to form ammonia gas. According to Le Chatelier's principle, how would increasing the pressure of the system affect the yield of ammonia gas? Provide a scientific explanation for your answer.

asked Jan 22 in Chemical reactions by JacquelynDos (2.3k points)

0 votes

1 answer 80 views

A chemical plant needs to separate a mixture of benzene and toluene using a distillation column. The feed contains 40% benzene and 60% toluene. Design a distillation column to achieve a distillate with at least 90% purity of benzene. Provide the reflux ratio and the number of theoretical trays required to meet the purity specification. Assume an operating pressure of 1 atm and th

asked Jan 22 in Chemical engineering by AntonioDaven (2.4k points)

0 votes

0 answers 40 views

A chemical plant has a mixture of ethanol and water with a known composition. The plant wants to separate the mixture using a distillation column. As a chemistry student, design a feasible distillation column that can effectively separate the mixture with the given composition. You need to specify the height, diameter, number of trays, reflux ratio, and other necessary parameters needed for designing the column. You are also required to provide an explanation for the choice of each parameter.

asked Jan 22 in Psychology by LillyHoskins (2.4k points)

0 votes

1 answer 60 views

A chemical mixture containing 30% ethanol and 70% water needs to be separated using a distillation column. The feed rate is 1000 kg/hr and the desired purity for both products is 99%. The distillation column has 20 theoretical trays, and the reflux ratio is 2.5. Determine the number of trays required to achieve the desired purity for both products.

asked Jan 22 in Chemical engineering by Barney65731 (2.6k points)

0 votes

1 answer 12 views

A chemical engineering firm has been tasked with designing a chemical reactor for the synthesis of ammonia gas from nitrogen and hydrogen gases. The plant requires a production of at least 1000 kg/h of ammonia gas, and the reactor should operate at a pressure of 200 atm and a temperature of 400°C. The student should determine the optimal size and design of the reactor by considering the reaction kinetics, thermodynamics, and fluid dynamics principles. The student should also select appropriate catalysts and determine the flow rate of the reactants required to achieve the desired production rate.

asked Jan 22 in Chemical engineering by Cathern2110 (2.7k points)

0 votes

1 answer 85 views

A chemical engineering company has a mixture of ethanol and water with a concentration of 30% ethanol to separate using a distillation column. The company needs to obtain a concentration of 80% ethanol in the distillate at a reflux ratio of 3. Calculate the number of theoretical plates required in the column for the separation, assuming no vapor or liquid bypass, and that the minimum vapor velocity is maintained.

asked Jan 22 in Chemical engineering by MatthewStore (2.9k points)

0 votes

1 answer 57 views

A chemical engineer wants to separate a mixture of ethanol and methanol using a distillation column. The feed to the column contains 30% ethanol and 70% methanol by mole. The engineer wants to obtain a distillate with 80% ethanol and a bottoms product containing no more than 1% ethanol. Determine the number of trays required in the distillation column to achieve this separation. Consider only equilibrium stages and assume that the feed is saturated liquid at its boiling point. The operating pressure of the column is 1 atm.

asked Jan 22 in Chemical engineering by Bev611336790 (2.3k points)

Page:

« prev
1
...
658
659
660
661
662
663
664
665
666
...
1000
...
next »

Recent questions without an upvoted answer

Categories