Recent questions in Chemistry

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A chemistry student has 20 grams of sodium hydroxide and 25 grams of hydrochloric acid. What is the limiting reactant in the reaction and how much product can be formed? (Assuming the balanced equation is NaOH + HCl → NaCl + H2O)

asked Jan 22 in Chemical reactions by PedroShuler0 (410 points)

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1 answer 39 views

A chemistry student has 100 grams of ammonia and 50 grams of oxygen. What is the limiting reactant in the reaction if the balanced equation is:4NH3 + 3O2 → 2N2 + 6H2O And how much of the other reactant will be left over after the reaction is complete?

asked Jan 22 in Chemical reactions by JohnettePass (290 points)

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1 answer 39 views

A chemistry student has 10 grams of sulfur and 15 grams of oxygen. Given the balanced equation for sulfur dioxide formation, how much sulfur dioxide can they produce? Which reactant will be the limiting reactant and what is the amount of the excess reactant?

asked Jan 22 in Chemical reactions by KendallWater (890 points)

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1 answer 65 views

A chemistry student has 10 grams of magnesium and 15 grams of oxygen gas to produce magnesium oxide. What is the limiting reactant and how much magnesium oxide can be produced?

asked Jan 22 in Chemical reactions by HenriettaDul (370 points)

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1 answer 71 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 FredaMoultri (620 points)

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1 answer 75 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 FCRJohnnie31 (370 points)

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1 answer 45 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 ShermanGregs (590 points)

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1 answer 49 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 ConnorBohn2 (230 points)

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1 answer 67 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 ReginaldS77 (410 points)

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1 answer 49 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 HildegardeL3 (470 points)

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1 answer 53 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 ShaunTulloch (550 points)

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1 answer 58 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 DelmarWalls (390 points)

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1 answer 54 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 Sybil50I0967 (310 points)

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1 answer 61 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 HeidiWhittem (270 points)

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1 answer 50 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 DNEMisty492 (350 points)

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1 answer 40 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 FosterDibell (330 points)

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1 answer 57 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 GrettaCopley (410 points)

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1 answer 53 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 AlyciaRapp20 (570 points)

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1 answer 65 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 QSALea374924 (330 points)

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1 answer 57 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 EdwinCamidge (410 points)

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