25,963 Answered Questions for the topic chemistry

Chemistry

10/25/23

Buffers weak acids conjugate base
Choose any weak acid from ka table list that will buffer at the following pH values. Choose whose ka is closest to the requested pH value. Also determine the ratio of weak acid to conjugate base(... more
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Chemistry

10/25/23

The standard heat of formation for Be(OH)2(s) is -903 kJ/mol at 298 K. Write the formation equation for Be(OH)2(s) that goes with this value of ΔH°.
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Chemistry

10/24/23

does polarity matter for real gasses?

like does polarity affect the molecule from being most like an ideal gas? or do we just look at the molar masses of the compound
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Chemistry

10/24/23

A potassium chromate solution is added to a copper (II) nitrate solution to produce potassium nitrate and copper (II) chromate
A potassium chromate solution is added to a copper (II) nitrate solution to produce potassium nitrate and copper (II) chromate UNBALANCED CHEMICAL equation
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Chemistry

10/24/23

how many moles of calcium carbonate are produced from 8.0 moles of sodium carbonate?
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Chemistry

10/24/23

MgCl 2 (aq)+2 NaOH(aq) →Mg(OH) 2 (s)+2 NaCl(aq) f 0.264 MMgC*l_{2} reacts with a 45.31 of 0.759 M to produce Mg(OH) 2 and NaCl calculate the mass of Mg(OH)2 that can be produced
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Chemistry

10/24/23

Could someone help me please

Zinc reacts with hydrochloric acid according to the reaction equation shown. Zn(s) + 2 HCI(ag) - > ZnCl2(aq) + H2(g) How many milliliters of 6.50 M HCl(ag) are required to react with 9.35 g of... more
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Chemistry

10/24/23

CHEMISTRY PH OF BA(OH)2
Assuming complete dissociation, what is the pH of a 3.58mg/L Ba(OH)2 solution?
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Chemistry

10/23/23

a student wants to prepare 200mL of a .970 M CaCl2 solution, starting from a 1.900 M CaCl2 stock solution. What volume of the stock solution will the student need to use to prepare the dilution?
how do i set this up and solve it?
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Chemistry

10/22/23

chemistry pressure

PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) Kp = 1.45 × 10⁻⁴ at 160 °C. A 1.00 L vessel at 160 °C is filled with PCl₅(g) at an initial pressure of 3.75 atm and allowed to come to equilibrium. What will be the... more
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Chemistry

10/22/23

A fertilizer contains 55.1% CH,N,O (urea), 26.8% KNO, and 14.8% (NH),HPO, by mass.How much fertilizer should someone apply to provide 2.00 g N to a plant?
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Chemistry

10/22/23

Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN .

Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.Calculate the... more
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Chemistry

10/21/23

Exam practice question
I need help solving this problem I am pretty sure it has to do with the Ideal Gas Law, but I don't understand how to solve cause in the Ideal gas law you don't use density or in my understanding... more
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Chemistry

10/21/23

What is the mass in grams of the excess Fe₂O₃ remaining after the partial reaction of 201 g Fe₂O₃ with 64.7 g Al? Give your answer to three significant figures.
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Chemistry

10/21/23

Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.
Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.
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Chemistry

10/21/23

Calculate the solubility at 25°C  of CuBr  in pure water and in 0.30M  NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to  2  significant digits.
Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN. You'll probably find some useful data in the ALEKS Data resource.Round your answer to 2 significant digits.
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Chemistry

10/21/23

Calculate the solubility at 25°C  of CuBr  in pure water and in 0.30M  NaCN . You'll probably find some useful data in the ALEKS Data resource. Round your answer to  2  significant digits.
Calculate the solubility at 25°C of CuBr in pure water and in 0.30M NaCN. You'll probably find some useful data in the ALEKS Data resource.Round your answer to 2 significant digits.
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Chemistry

10/21/23

How do you find the enthalpy for the overall reaction?
Given Fe2O3+3CO—> 2Fe+3CO2 ΔH=-23.44 kJFe3O4+CO—> 3FeO+CO2 ΔH=21.79 kJFe+CO2–>FeO+CO ΔH=-10.94 kJHow do you find the enthalpy for the overall reaction:3Fe2O3+CO—>2Fe3CO4+CO2?
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Chemistry

10/20/23

HCN is a weak acid (Ka = 6.20 x 10-10), so the salt, KCN, acts as a weak base. What is the pH of a solution that is 0.0315 M in KCN at 25 °C?
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Chemistry

10/20/23

Determine the equilibrium partial pressure of NH3 in a reaction vessel that initially contained 0.900 atm N2 and 0.500 atm H2 at 648 K.

The value of Kp for the reaction below is is 4.30 × 10–4 at 648 K.3H2​(g)+N2​(g)2NH3​(g)Determine the equilibrium partial pressure of NH3 in a reaction vessel that initially contained 0.900 atm... more
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Chemistry

10/20/23

Calculate the equilibrium partial pressure of CO if initially PCO2 = 1.32 atm and PCO = 4.85 atm. Pure graphite is present initially and when equilibrium is achieved.
Making CO from CO2 is a potential energy source. The value of Kp for the reaction is is 1.50 at 700.0°C.CO2​(g)+C(s)2CO(g)A. Calculate the equilibrium partial pressure of CO if initially... more
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Chemistry

10/20/23

If a reaction vessel at this temperature initially contains 0.500 atm NO2, what will be the partial pressure of NO2 in the vessel when equilibrium has been attained?
The equilibrium constant Kp for the thermal decomposition of NO2 is 6.5 × 10–6 at 450°C.2NO2​(g)2NO(g)+O2​(g)A. If a reaction vessel at this temperature initially contains 0.500 atm NO2, what... more
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Chemistry

10/20/23

From these data, calculate the value of ΔH° for the reaction.
The equilibrium constant for the reaction below decreases from 11160.0 at 520.0°C to 17.0 at 820.0°C.4NO + 3O2 ---> 2N2O5
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Chemistry

10/20/23

Calculate the standard free energy change (R = 8.314 J/K·mol).
Debate continues on the practicality of H2 gas as a fuel. The equilibrium constant for the reaction below is 1.0 × 105 at 25°C.CO2+H2O --> CO2+H2A. Calculate the standard free energy change (R... more
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Chemistry

10/20/23

What is the total pressure in the container after equilibrium has been established?
Ammonium carbamate, NH4OCONH2, decomposes to produce ammonia and carbon dioxide. At 25.05 °C the value Kp for this reaction is 0.00402 .NH4OCONH2 reaction ---> 2NH3 + CO2A large amount of solid... more
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