Recent questions in Chemistry

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1 answer 78 views

A chemistry student is given a sample of an unknown compound and is asked to determine its molecular formula and possible functional groups using mass spectrometry. The mass spectrum of the compound shows a molecular ion peak at m/z 158 and three intense fragmentation peaks at m/z 132, 104, and 77. Using this information, determine the molecular formula and possible functional groups of the unknown compound.

asked Jan 22 in Analytical Chemistry by BGAJefferson (410 points)

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1 answer 54 views

A chemistry student is given a sample of a solution containing a known amount of sodium chloride (NaCl) dissolved in water. The student needs to determine the concentration of the NaCl in the solution, using mass balance calculations. The student has access to a balance and other necessary laboratory equipment. What is the concentration of NaCl in the solution given to the student? How much NaCl is present in the solution, and how much water was used to dissolve it?

asked Jan 22 in Analytical Chemistry by LakeishaA172 (230 points)

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1 answer 78 views

A chemistry student is given a sample of a compound containing sulfur, oxygen, and carbon. The student needs to determine the mass percentages of each element in the compound using mass balance calculations. The sample has a total mass of 5.00 grams, and the student devises an experiment to isolate each of the three elements by chemical reactions, and the mass of each element is recorded as follows: 1.20 g sulfur, 1.80 g oxygen, and 2.00 g carbon. What are the mass percentages of sulfur, oxygen, and carbon in the compound?

asked Jan 22 in Analytical Chemistry by BobbyeY74750 (170 points)

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1 answer 57 views

A chemistry student is given a piece of copper and asked to react it with dilute hydrochloric acid. Will the reaction occur and if so, what product (if any) will be produced? Use your knowledge of single replacement reactions to explain your answer.

asked Jan 22 in Chemical reactions by AubreyCato6 (350 points)

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1 answer 127 views

A chemistry student is given a chemical equation for the reaction between calcium chloride and sodium carbonate. The equation is unbalanced and the student must balance it, while ensuring that the correct stoichiometric coefficients for each compound are used. The student must then calculate the mass of product formed when 5.0 grams of calcium chloride react completely with excess sodium carbonate. What is the mass of the product formed?

asked Jan 22 in Inorganic Chemistry by BlakeCarrier (390 points)

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1 answer 10 views

A chemistry student is given a 25 mL sample of a solution containing an unknown amount of sodium chloride. After adding excess silver nitrate solution to the sample, the student records the mass of the resulting precipitate to be 2.655 grams. Using mass balance calculations, determine the mass percentage of sodium chloride in the original solution.

asked Jan 22 in Analytical Chemistry by MargheritaMa (250 points)

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1 answer 79 views

A chemistry student is given a 10 mL sample of a solution containing chloride ions and sulfate ions, and is asked to determine the mass of each ion present in the sample. The student knows that the total mass of the solution is 12.25 g, and that the density of the solution is 1.225 g/mL. The student also knows that the mass percent of chloride ions in the solution is 5%, and the mass percent of sulfate ions is 10%. Using mass balance calculations, what is the mass of chloride ions and sulfate ions present in the sample?

asked Jan 22 in Analytical Chemistry by Jeramy133586 (390 points)

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1 answer 100 views

A chemistry student is experimenting with the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g). They want to investigate the effect of pressure on the yield of ammonia. Write a problem for the student to solve using Le Chatelier's principle that will help them predict the effect of changes in pressure on the equilibrium position of the reaction.

asked Jan 22 in Chemical reactions by PearlineNewe (170 points)

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1 answer 53 views

A chemistry student is conducting an experiment in a closed container where nitrogen dioxide is being converted into nitrogen oxide and oxygen gas. If the student increases the concentration of the nitrogen dioxide in the container, how will it affect the equilibrium position of the reaction and what can be done to restore the equilibrium position? Use Le Chatelier's principle to explain your answer.

asked Jan 22 in Chemical reactions by Bret83R12627 (330 points)

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1 answer 73 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 66 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 49 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 96 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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