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... more
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... more
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... more
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 Math

1d

Help me solve this!!

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... more

1d

Help me solve this!!

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)
Chemistry Math Biochemistry

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... more
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... more
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:CH3​CHF2​(g)CH2​CHF(g)+HF(g)Part 1). At 460K, the rate... more
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–1.4PH3​P4​+6H2​If the reaction is begun with an initial PH3 concentration of 0.95 M, what will... more
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... more
Chemistry

1d

May I get help.

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... more
Chemistry

1d

May I get help on this?

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... more
Chemistry Math Biochemistry

1d

Help me solve this

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)
Chemistry Math Biochemistry

1d

Help me solve this!!

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

Help me solve this problem??

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... more
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?... more
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)... more
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... more

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