Recent questions in Chemistry

0 votes

1 answer 71 views

A 50.0 g sample of ethanol is heated from 25.0 °C to 85.0 °C, and absorbs 237 J of heat. What is the specific heat capacity of ethanol?

asked Jan 22 in ThermoChemistry by FelipaWainsc (210 points)

0 votes

1 answer 56 views

A 50 mL solution of 0.1 M Cu(NO3)2 was electrolyzed for 20 minutes. During this time, a current of 0.5 A was passed through the solution. What is the final concentration of Cu2+ ions in the solution after the electrolysis?

asked Jan 22 in ElectroChemistry by TawnyaMull6 (230 points)

0 votes

1 answer 57 views

A 5 g sample of a mixture containing sand and salt is dissolved in water. The solution is filtered, and the sand is collected and dried. The dried sand has a mass of 3 g. Using mass balance calculations, determine the percentage of salt in the original mixture.

asked Jan 22 in Analytical Chemistry by LucyGreene29 (490 points)

0 votes

1 answer 65 views

A 25 mL solution of 0.1 M AgNO3 is mixed with a 50 mL solution of 0.05 M NaCl. What is the mass of AgCl that will be produced if a reaction occurs? (Assume the reaction goes to completion.)

asked Jan 22 in Chemical reactions by NydiaAngulo5 (450 points)

0 votes

1 answer 59 views

A 25 g sample of water at 25°C is heated by 200 J. The temperature of the water increases to 40°C. Calculate the specific heat capacity of water.

asked Jan 22 in Chemical thermodynamics by CherylYoul4 (370 points)

0 votes

1 answer 80 views

A 2.5 L container was initially filled with 0.1 M solution of nitrogen dioxide which decomposes into nitrogen monoxide and oxygen gas according to the following reaction:2NO2(g) ⇌ 2NO(g) + O2(g)After the system has reached equilibrium, the concentration of nitrogen monoxide is found to be 0.05 M. What is the equilibrium concentration of oxygen gas in the container?

asked Jan 22 in Chemical equilibrium by MagdaLanglai (610 points)

0 votes

1 answer 48 views

A 15.0 g sample of a mixture containing sodium chloride and sodium nitrate is dissolved in water, and then silver nitrate is added until no more precipitation occurs. The mass of the precipitate is found to be 20.4 g. What is the mass percentage of each component in the mixture?

asked Jan 22 in Analytical Chemistry by Ines7852940 (490 points)

0 votes

1 answer 42 views

A 1.00 gram sample of sucrose (C12H22O11) is completely hydrolyzed in solution with excess HCl. If the solution is cooled to room temperature, what is the change in enthalpy ($\Delta H$) for the reaction? The heat capacity of the solution is 4.18 J/(g*K) and the temperature change is -10°C.

asked Jan 22 in ThermoChemistry by GladysHailes (510 points)

0 votes

1 answer 53 views

A 0.50 L vessel contains 1.0 mol of N2(g) and 3.0 mol of H2(g) at equilibrium at 400 K according to the following equation:N2(g) + 3H2(g) ⇌ 2NH3(g)If the volume of the vessel is suddenly decreased to 0.25 L, what will happen to the equilibrium position? Will the concentration of NH3 increase or decrease? Calculate the new equilibrium constant at this new volume.

asked Jan 22 in Chemical equilibrium by Margarita30G (490 points)

0 votes

1 answer 52 views

A 0.25 mol/L solution of ethanoic acid (CH3COOH) is mixed with a 0.40 mol/L solution of sodium acetate (CH3COONa). The equilibrium constant for the reaction CH3COOH + NaCH3COO ⇌ CH3COONa + H2O is 1.8 x 10^-5. What is the concentration of CH3COONa at equilibrium?

asked Jan 22 in Chemical equilibrium by GenevieveMac (330 points)

0 votes

1 answer 40 views

A 0.1 M solution of ammonia (NH3) has a pH of 11.64 at room temperature. If sodium hydroxide (NaOH) is added to this solution such that the concentration of OH- ions becomes 0.01 M, what will be the new pH of the solution? (Assume that the dissociation of water can be ignored)

asked Jan 22 in Chemical equilibrium by JeanGertz702 (890 points)

0 votes

1 answer 48 views

How would adding more reactants to a reaction at equilibrium affect the direction of the reaction and the equilibrium position, and what would be the quantitative effect on the equilibrium constant?

asked Jan 22 in Chemical equilibrium by HerbertFulch (410 points)

0 votes

1 answer 51 views

How does the specific surface area of a solid catalyst affect the rate of reaction for the decomposition of hydrogen peroxide?

asked Jan 22 in Surface Chemistry by NellieAbdull (550 points)

+1 vote

1 answer 45 views

How does the CYP3A4 enzyme affect the metabolism and potential interactions of commonly prescribed drugs in the treatment of cardiovascular disease?

asked Jan 22 in Medicinal Chemistry by TanyaPridgen (570 points)

0 votes

1 answer 50 views

How does the coordination chemistry of metalloenzymes and metalloproteins contribute to their functionality in biological processes?

asked Jan 22 in Coordination Chemistry by Clinton73660 (390 points)

0 votes

1 answer 50 views

How do the coordination chemistry principles of chelation therapy contribute to the removal of toxic metal ions from the human body?

asked Jan 22 in Coordination Chemistry by RhondaMcfadd (450 points)

+1 vote

1 answer 9 views

How can we use the knowledge of the chemical makeup of different viruses to design drugs that target their specific characteristics and prevent infection?

asked Jan 22 in Medicinal Chemistry by CandiceLabou (580 points)

0 votes

1 answer 8 views

How can computational chemistry be used to design new metal-organic frameworks with optimal properties for carbon capture and storage?

asked Jan 22 in Computational Chemistry by FrederickaCe (350 points)

0 votes

1 answer 44 views

How does increasing the temperature affect the rate of reaction between sodium thiosulfate and hydrochloric acid?

asked Jan 22 in Chemical kinetics by MadeleineEdg (590 points)

0 votes

1 answer 45 views

What is the pH of 0.1 M solution of HCl knowing that its dissociation constant is 1.3 x 10^-4?

asked Jan 22 in Inorganic Chemistry by RussFries886 (430 points)

Categories