Recent questions in Chemistry

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1 answer 83 views

A chemistry student is asked to find the standard cell potential for the redox reaction: Mg(s) | Mg²⁺(aq, 0.1 M) || Cu²⁺(aq, 0.01 M) | Cu(s) Given that the standard potential for the reduction of Mg²⁺ is -2.37 V and for the reduction of Cu²⁺ is +0.34 V. The student should show how to calculate the cell potential and determine if the reaction will proceed spontaneously or not.

asked Jan 22 in ElectroChemistry by JonAlvarez52 (570 points)

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1 answer 67 views

A chemistry student is asked to determine the effect of temperature and pressure on the equilibrium of the reaction: 2NO2(g) ⇋ N2O4(g) using Le Chatelier’s principle. The initial concentration of NO2(g) is 0.5 mol/L and the reaction is carried out at 25°C. How will the equilibrium shift if the temperature is increased to 100°C and the pressure is decreased to 0.5 atm?

asked Jan 22 in Chemical reactions by DexterDuncom (130 points)

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1 answer 48 views

A chemistry student is asked to determine the concentration of copper ions in a 500 mL solution of copper sulfate. The student has access to a balance, a pipette, and standard solutions of sodium hydroxide and sulfuric acid. Using the mass balance calculations, what is the concentration of copper ions in the solution?

asked Jan 22 in Analytical Chemistry by TraceyX33447 (290 points)

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1 answer 50 views

A chemistry student is asked to determine the concentration of a particular compound in a sample of drinking water. The student collects a 100 mL water sample and adds a known amount of a standard solution containing the compound. After allowing the solution to equilibrate, the student measures the concentration of the compound in the new solution using a spectrophotometer, to be 0.0125 M. Assuming mass balance, calculate the concentration of the compound in the original drinking water sample.

asked Jan 22 in Analytical Chemistry by CodyCaswell2 (430 points)

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1 answer 50 views

A chemistry student has two containers, one with 25 grams of hydrogen gas and the other with 35 grams of oxygen gas. What mass of water can be produced when these two gases undergo a reaction and which gas is the limiting reactant?

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

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1 answer 78 views

A chemistry student has mixed 0.1 mol of hydrochloric acid (HCl) with 0.2 mol of sodium hydroxide (NaOH). What is the pH of the resulting solution?

asked Jan 22 in Inorganic Chemistry by JacquelynP76 (230 points)

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1 answer 92 views

A chemistry student has a sample of an unknown compound containing carbon, hydrogen, and oxygen. The mass of the sample is 2.50 g. After combustion, the student finds that 1.80 g of carbon dioxide, 0.75 g of water, and 0.20 g of oxygen are produced. Using mass balance calculations, determine the empirical formula of the unknown compound.

asked Jan 22 in Analytical Chemistry by QHMDustin636 (130 points)

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1 answer 62 views

A chemistry student has 5 g of magnesium (Mg) and 10 g of hydrochloric acid (HCl) to react. What mass of magnesium chloride (MgCl2) will be produced? (Assuming the reaction goes to completion and all the reactants are used up)

asked Jan 22 in Chemical reactions by Melba49S9226 (290 points)

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1 answer 48 views

A chemistry student has 25g of sulfur and 30g of oxygen to produce sulfur dioxide. If the equation for the reaction is: S + O2 → SO2, what is the limiting reactant and how much sulfur dioxide will be produced?

asked Jan 22 in Chemical reactions by AimeeFirkins (490 points)

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1 answer 102 views

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 OmarPelloe6 (370 points)

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1 answer 56 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 ConnieCumpst (330 points)

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1 answer 53 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 JustineRocho (390 points)

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1 answer 77 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 LizaWhyte863 (310 points)

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1 answer 90 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 LawrenceLaws (330 points)

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1 answer 92 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 ReubenWunder (530 points)

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1 answer 52 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 ChandaBullin (290 points)

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1 answer 56 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 MalindaLemie (430 points)

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1 answer 77 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 Melinda41J1 (390 points)

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1 answer 59 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 AugustinaHea (570 points)

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1 answer 66 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 LasonyaMarro (350 points)

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