25,963 Answered Questions for the topic chemistry

Chemistry

04/16/24

What is this energy in kj/mol?
A proton is accelerated to 13.8 MeV per particle. What is this energy in kJ/mol?
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Chemistry

04/16/24

Calculate the Energy released in kj
The easiest fusion reaction to initiate is ²₁H + ³₁H → ⁴₂He + ¹₀n Calculate the energy released, in kJ, per nucleus of ⁴₂He produced. The masses of the relevant particles are as follows (1 amu =... more
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Chemistry

04/14/24

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. BrO3-(aq)+Zn(s)→Br-(aq)+Zn(OH)4 2-(aq)
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Chemistry

04/12/24

How to find the percent by mass

I need to find the percent by mass of H2O2 in a solution of KMnO4. To do so, I need to know how many moles of H2O2 reacted in the titration to do my calculation (mass of H2O2 reacting/ mass of H2O2... more
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Chemistry

04/11/24

What is S° for A in the reaction 3 A → 2 B if ∆S°(rxn) =-147.3 J/mol ･ K? [S° (B) = (240.0 J/mol ･K)]
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Chemistry

04/11/24

Write the net ionic equation for the cell reaction:
A lead–acid automotive battery consists of voltaic cells in series. The cathode of each cell consists of lead(IV) oxide (PbO2) packed in a metal grid. The anode of each cell is composed of lead.... more
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Chemistry

04/10/24

The mass of calcium hydroxide that is dissolved in 175 mL of a saturated solution is _____ grams.
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Chemistry

04/10/24

The volume of water needed to dissolve 0.0724 grams of lead sulfate is ______ L. Assume no volume change upon addition of the solid.
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Chemistry

04/10/24

The Solubility Product Constant for zinc phosphate is 9.1x10^-33 . The maximum amount of zinc phosphate that will dissolve in a 0.118 M zinc acetate solution is ___ M.
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Chemistry

04/10/24

The Solubility Product Constant for nickel(II) sulfide is 3.0x10^-21. The molar solubility of nickel(II) sulfide in a 0.184 M ammonium sulfide solution is ___ M.
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Chemistry

04/10/24

Solid ammonium bromide is slowly added to 175 mL of a 0.153 M silver nitrite solution until the concentration of bromide ion is 0.0628 M. The percent of silver ion remaining in solution is ____ %.
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Chemistry

04/10/24

Solid sodium fluoride is slowly added to 150 mL of a barium nitrate solution until the concentration of fluoride ion is 0.0479 M. The maximum amount of barium ion remaining in solution is _____ M
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04/10/24

Dilutions in an assay

HelloI'm confused on why we have to dilute our samples? like what is the purpose other than making sure its in the range of a spectrometer? How do dilutions help us find the concentration of... more
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Chemistry

04/10/24

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.070 mol of HCl were added?
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.070 mol of HCl were added?
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Chemistry

04/10/24

Thermochemistry problem

A 75g piece of metal is removed from a pot of boiling water and placed into a calorimeter with 100mL of water that has an initial temperature of 20.8°C. After the metal is put in the water, the new... more
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Chemistry

04/10/24

Heat of formation
If the heat of combustion of benzene is -3267.6 kJ/mol and the delta H for CO2 is -393.5 kJ/mol with the delta H for H20 being -285.8 kJ/mol, find the heat of formation of benzene, C6H6.
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Chemistry

04/10/24

If a balloon will rise off the ground when it contains 0.0211 mol of helium in a volume of 0.460 L, how many moles of helium are needed to make the balloon rise when its volume is 0.867 .
Assume that temperature and pressure stay constant.
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Chemistry

04/10/24

A helium-filled balloon at sea level has a volume of 2.3 L at 0.987 atm and 34°C.

If it is released and rises to an elevation at which the pressure is 0.900 atm and the temperature is 31°C, what will be the new volume of the balloon?
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Chemistry

04/10/24

A rigid plastic container holds 1.00 L methane gas at 660 torr pressure when the temperature is 21.1°C. How much more pressure will the gas exert if the temperature is raised to 43.9°C?
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Chemistry

04/10/24

What is the molar mass of a sample of gas that has the density of 1.55g/L at 1.45 atm pressure and 25.0°C?
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Chemistry

04/10/24

Determine how many liters 8.47g of carbon dioxide gas would occupy at the following conditions.
STP140°C and 5.00 atm239K and 109 laps
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Chemistry

04/10/24

Determine how many liters 8.47g of carbon dioxide gas would occupy at the following conditions.
STP140°C and 5.00 atm239K and 109 laps
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Chemistry

04/09/24

Chemical equation stoich

How much C2H4N2 could be expected from the reaction of 14.1 g CO2, 2.17 g NH3, and 1.73 g CH4?
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Chemistry

04/09/24

What is the volume of NH3 produced in the following reaction when 3.0L of N2 reacts with 4.0L of H2?
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Chemistry Math

04/09/24

Can someone PLEASE explain how the graph of k directly proportional to e^1/T is made??
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