21,087 Answered Questions for the topic chemistry
Chemistry
6h
Chemistry 102: Kinetics: Arrhenius Equation
The rate constant for the reaction below was determined to be 3.241×10-5 s–1 at 800 K. The activation energy of the reaction is 265 kJ/mol. What would be the value of the rate constant...
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Chemistry
17h
Entropy Change From energy to Water
What is the entropy change when 383 J of energy is reversibly transferred to a sample of water at 25°C?
Chemistry
18h
How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?
A student is running an experiment in which 54.1 grams of KF is needed, but the only jar of reagent in the lab is labelled potassium fluoride dihydrate. How many grams of the hydrate must the...
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Chemistry
18h
It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).
It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).A 44.97 gram sample of a hydrate of CaSO4 was heated thoroughly in a porcelain...
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Chemistry
21h
Gas Laws - Chemistry
Which sample contains more atoms: 1,340 mL of neon at 35.5 ˚C and 840 mmHg or 1.48 L of argon at 48.9 ˚C and 0.790 atm? moles Ne = _______ molmoles Ar = ______mol
Chemistry
22h
A solution containing 15.2 g of a molecular compound dissolved in 100.0 g of water has a boiling point of 101.5 °C. Calculate the molar mass of the compound. The 𝐾b for water is 0.512 °C/m.
molar mass = g/mol?
Chemistry Math
1d
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What is the expected freezing point of a solution made by dissolving 15.03g of potassium chlorate in 69.50mL of water?The freezing point depression constant for water is 1.86°C/molal. Report your...
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1d
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You have prepared an iron(III) solution by diluting 13.50mL of 7.73M iron(III) nitrate to a total volume of 270.0mL. What is the iron(III) ion concentration in this new solution? (show steps)
1d
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What is the expected boiling point of a solution made by dissolving 14.33g of glycerol (C3H8O3) in 51.00mL of water?The boiling point elevation constant for water is 0.512°C/molal. Report your...
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Chemistry
1d
∆S phase change from liquid to solid
Determine ∆S for the phase change of 2.52 moles of water from liquid to solid at 0.0 °C. (∆H = -6.01 kJ/mol)
Chemistry
1d
Chemistry 102: Kinetics: rate constant
The rate constant for the reaction below was determined to be 3.241×10-5 s–1 at 800 K. The activation energy of the reaction is 265 kJ/mol. What would be the value of the rate constant...
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Chemistry
1d
Chemistry 102: Kinetics: frequency factor and temperature
The compound 1,1-difluoroethane decomposes at elevated temperatures to give fluoroethylene and hydrogen fluoride according to the equation:CH3CHF2(g)CH2CHF(g)+HF(g)Part 1). At 460K, the rate...
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Chemistry
1d
Kinetics: Chemistry 102: concentration problem
The rate of decomposition of PH3 was studied at 951.00 °C. The rate constant was found to be 0.0595 s–1.4PH3P4+6H2If the reaction is begun with an initial PH3 concentration of 0.95 M, what will...
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Chemistry
1d
Can I get help on this please?
A 1.180 g1.180 g sample contains only vitamin C (C6H8O6)(C6H8O6) and sucralose (C12H19Cl3O8).(C12H19Cl3O8). When the sample is dissolved in water to a total volume of 26.4 mL,26.4 mL, the osmotic...
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Chemistry
1d
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A 2.96 L2.96 L aqueous solution of KOHKOH contains 181 g181 g of KOHKOH. The solution has a density of 1.29 g/mL1.29 g/mL.Calculate the molarity (𝑀M), molality (𝑚m), and mass percent concentration...
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Chemistry
1d
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Express each of these concentrations in parts per million (ppm).6.3 milligrams per kilogram of waterConcentration=ppm?6.3 micrograms per kilogram of waterConcentration=ppm?6.3 nanograms per...
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1d
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You have prepared a solution by dissolving 73.15mg of sucrose (table sugar, C12H22O11) in 1.55kg of water. What is this solution's sucrose concentration in parts per million, ppm? (show steps)
1d
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You have prepared a solution by dissolving 2.709g of nickel(II) chloride tetrahydrate in 60.0mL of water. What is this solution's chloride ion concentration in molality, m? (show steps)
Chemistry Biochemistry
1d
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You have prepared a solution by dissolving 232.29mg of copper(II) nitrate pentahydrate in 1.45kg of water. What is this solution's Cu+2 concentration in parts per million, ppm? (show steps)
Chemistry Biochemistry
1d
Help me solve this
You have prepared a solution by dissolving 232.29mg of copper(II) nitrate pentahydrate in 1.45kg of water. What is this solution's Cu+2 concentration in parts per million, ppm? (show steps)
Chemistry
1d
How many ATOMS of carbon are present in 1.59 moles of carbon monoxide? How many MOLES of oxygen are present in 9.31×1022 molecules of carbon monoxide?
How many ATOMS of carbon are present in 1.59 moles of carbon monoxide? ______ atoms of carbon.
How many MOLES of oxygen are present in 9.31×1022 molecules of carbon monoxide? _____ moles...
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Chemistry
1d
How many MOLECULES of sulfur dichloride are present in 8.04 grams of this compound? How many GRAMS of sulfur dichloride are present in 9.25×1022 molecules of this compound?
1. How many MOLECULES of sulfur dichloride are present in 8.04 grams of this compound? _____ molecules.2. How many GRAMS of sulfur dichloride are present in 9.25×1022 molecules of this compound?...
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Chemistry
1d
N2H4 + 2Fe(OH)2 ------> N2 + 2Fe+ 4 H2O
N2H4 + 2Fe(OH)2 ------> N2 + 2Fe+ 4 H2OIn the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.a)...
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Chemistry
1d
Oxalic acid dihydrate is a solid, diprotic acid that can be used in the laboratory as a primary standard. Its formula is H2C2O4•2H2O.
Oxalic acid dihydrate is a solid, diprotic acid that can be used in the laboratory as a primary standard. Its formula is H2C2O4•2H2O.A student dissolves 0.851 grams of H2C2O4•2H2O in water and...
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