25,963 Answered Questions for the topic chemistry

Chemistry

07/29/23

I don't understand this Rydberg Equation Question
I found this question in my textbook.The hydrogen atom emits a photon with a 486 nm wavelength, corresponding to an electron decaying from the n = 4 level to which level?I first calculated... more
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Chemistry Math Science Physics

07/29/23

Determine the vertical positions of the ball for every interval of 1s until 10.0 seconds.
Shelley threw a tennis ball upward near the edge of a cliff that is about 100 meters above sea level. Suppose the ball was thrown with a speed of 30.1 m/s. Determine the vertical positions of the... more
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Chemistry

07/28/23

The following initial rate data are for the oxidation of nitrogen monoxide by oxygen at 25 °C:
The following initial rate data are for the oxidation of nitrogen monoxide by oxygen at 25 °C:2NO+O₂ → 2NO2Experiment1234Rate =[NO] o, M0.00342k=0.006840.003420.00684[0₂]0, M Initial Rate, M.... more
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Chemistry

07/28/23

The reaction between lead ion and chloride ion is given below:
The reaction between lead ion and chloride ion is given below: Pb2+(aq) + 2 Cl-(aq) PbCl2(s) We therefore know that which of the following reactions can also occur? Pb(s) + Cl2(g) ... more
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Chemistry

07/28/23

For the reaction 2H2O --> 2H2 + O2, which is the value of delta S
None of the aboveundeterminednegativezeropositive
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Chemistry

07/28/23

The ∆G° of vaporization for cyclohexane at 298 K and 1.00 atm is -0.2164 kJ/mol. Calculate the pressure, in atm, of cyclohexane vapor in equilibrium with cyclohexane liquid at 298 K.
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Chemistry

07/28/23

What is the entropy change when 1.40 moles of CCl₂F₂ condenses at 25.0 °C? [∆H(vap) = 17.2 kJ/mol at 25.0 °C]
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Chemistry

07/27/23

Determine ∆S for the phase change of 1.38 moles of water from solid to liquid at 0 °C. (∆H = 6.01 kJ/mol)
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Chemistry

07/27/23

Ka for the acid
Enough of a monoprotic weak acid is dissolved in water to produce a 0.01850.0185 M solution. The pH of the resulting solution is 2.342.34. Calculate the Ka for the acid.I keep getting 0.00113
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Chemistry

07/27/23

Calculate Ka for the acid
Enough of a monoprotic acid is dissolved in water to produce a 1.821.82 M solution. The pH of the resulting solution is 2.972.97. Calculate the Ka for the acid.
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Chemistry

07/26/23

Which compound is least soluble

Which compound below is the least soluble in water based on its Ksp value?A.) Fe(OH)2 ksp = 4.87×10-17
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Chemistry

07/26/23

Identify equation for Keq
Identify the equation for which Keq = [Ag+][CrO42-]
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Chemistry

07/26/23

Which of the following forms a solution with a pH of 13.7?
Answer choices0.02M solution of NaOH None of the above 0.5M solution of NaOH 0.04M solution of Mg(OH)2 0.5M solution of HClO4
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Chemistry

07/26/23

Calculate the pH of a 0.035 M sulfuric acid solution
Answer choices: None of the above1.890.891.151.46
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Chemistry

07/26/23

Chemistry Equation
2 NH3  +  3 CuO   g  3 Cu  +  N2  +   3 H2OIn the above equation how many moles of water can be made when 23 moles of NH3 are consumed?
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Chemistry

07/26/23

Half life mass of sample

Lead-210 has a half life of 20.4 years. What mass of a 2.00 g sample of Lead-210 will remain after 61.2 years?
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Chemistry

07/25/23

Hess's Law Problem 4
Consider the following reactions:C(s) + 2H2O(g) --> CO2(g) + 2H2(g) Enthalpy = +163.0 kJ/moleC(s) + ½O2(g) ---> CO(g) Enthalpy = -121.0 kJ/moleH2O(g) ---> H2O(l) Enthalpy = -40.7... more
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Chemistry

07/24/23

Can someone please explain to me the Law of Multiple Proportions? Can you give an example?
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Chemistry

07/24/23

Hess's Law and Enthalpy
Given:CH3COOH(l) + 2O2(g) --> 2CO2(g) + 2H2O(l) =-871kJ/moleC(graphite) + O2(g) --> CO2(g) =-394kJ/moleH2(g) + 1/2O2(g) --> H2O(l) -286kJ/moleCalculate the enthalpy for the... more
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Chemistry

07/24/23

Hess's Law Problem #6
What is the enthalpy for the reaction: C2H4 + H2 --> C2H6 given the following equations:C2H4(g) + 3O2(g) --> 2CO2(g) + 2H2O(l) = -1401kJ/moleC2H6(g) + 7/2O2(g) --> 2CO2(g) + H2O(l)... more
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Chemistry

07/24/23

Hess's Laws Problem
Given the following equations:N2(g) + O2(g) --> 2NO(g) = +190.0kjN2(g) +3H2(g) --> 2NH3(g) = -91.8kj2H2(g) + O2(g) --> 2H2O(g) = -483.7kjCalculate the enthalpy for the reaction:4NH3(g) +... more
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Chemistry

07/24/23

Hess Law Problem 2
Consider the following reactions:C(s) + 2H2O(g) --> CO2(g) + 2H2(g) Enthalpy = +163.0 kJ/moleC(s) + ½O2(g) ---> CO(g) Enthalpy = -121.0 kJ/moleH2O(g) ---> H2O(l) Enthalpy = -40.7... more
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Chemistry

07/24/23

Hess's Law Problem
Given:SO2 + 1/2O2 ---> SO3 = Delta H of +89.5kJS + 3/2O2 -----> SO3 = Delta H of -204.2kjCalculate the Delta H for the reaction:S + O2 ---> SO2
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Chemistry

07/24/23

Determine the value of a in order for Kc to be the same value as Kp. aA(g) + 2B(g) ←→ 3C(s) + 5D(g)
Answer choices654None of the above2
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Chemistry

07/23/23

What is the density of 15 M NaOH
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