10/08/22

Limiting Reagant problem
Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. Suppose 6.47 g of hydrobromic acid is mixed with 5.2 g of... more
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10/08/22

pH Acid-Bases Chem, Buffers & Titrations

Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.27 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵)a) What is the pH of this buffer?b) What is the pH of the buffer after 0.750 mol of H⁺ have been... more
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10/08/22

Calculate the energy of a photon of electromagnetic radiation at each of the following frequencies.
Calculate the energy of a photon of electromagnetic radiation at each of the following frequencies. 106.2 MHz (typical frequency for FM radio broadcasting) 1065 kHz (typical frequency for AM radio... more
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10/08/22

An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated?
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10/07/22

Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions. (Express your answer in inverse seconds to three significant... more
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10/07/22

Chemistry Problem
f a solution containing 39.689 g of mercury(II) chlorate is allowed to react completely with a solution containing 12.026 g of sodium dichromate, how many grams of solid precipitate will form?How... more
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10/07/22

write the balced NET ionic equation for the reaction when Al(NO303 and Na33PO4 are mixed in aqueous solution
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10/07/22

what is the answer?
If a system has 375 kcal of work done to it, and releases 5.00×102 kJ of heat into its surroundings, what is the change in internal energy (Δ𝐸 or Δ𝑈) of the system?Δ𝐸=
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10/07/22

NiCl3 is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.700 M NiCl3 solution.
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10/07/22

Im not sure how to answer this question
Determine the energy of 1.90 mol of photons for visible light (595 nm).
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10/07/22

A 0.22-calibre handgun fires a 25 g bullet at a velocity of 700 m s−1. Calculate the de Broglie wavelength of the bullet. Is the wave nature of matter significant for bullets?
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10/07/22

A proton in a linear accelerator has a de Broglie wavelength of 141 pm .
A proton in a linear accelerator has a de Broglie wavelength of 141 pm . What is the speed of the proton? (The mass of the proton is 1.673×10−271.673×10−27 kg and 1 J = 1 (kg⋅m^2)/s^2
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10/07/22

Enthalpy formation from enthalpy reaction

A scientist measures the standard enthalpy change for the following reaction to be -208.5 kJ :CO(g) + 3 H2(g)CH4(g) + H2O(g)Based on this value and the standard enthalpies of formation for the... more
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10/07/22

Enthalpy formation from enthalpy reaction
A scientist measures the standard enthalpy change for the following reaction to be 6.6 kJ :Fe(s) + 2 HCl(aq)FeCl2(s) + H2(g)Based on this value and the standard enthalpies of formation for the... more
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10/06/22

Need help finding liters needed in a reduction reaction :) (Problem in desc)
Iron is produced by reduction from its ore according to the reaction Fe2O3(s) + 3 H2(g) --> 2 Fe(s) + 3 H2O(g) How many liters of H2 gas are required to completely react with 34.2 g of Fe2O3 at... more
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10/06/22

Molarity General Chem
Determine the molarity of 3.80 g KMnO4 in 225.3 mL solution
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10/06/22

Chemistry 120 Lab Question

upon heating a 4.250 gram sample of Na2SO4 x nH2O sample loses 2.388 grams upon heating. What is n for this hydrate?
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10/06/22

What volume of O2 at 1.86 106Pa and 375 K is required to completely react with 1.78 L of H2 at the same temperature and pressure to produce H2O? How many O2 and H2 molecules have reacted?
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10/06/22

How far away, in kilometres, is Sirius from the sun?
The distance from our sun to Sirius, the brightest star of the night sky, is 8.6 light years. A light year is the distance that light travels in one year (365 days).How far away, in kilometres, is... more
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10/05/22

Calculate the wavelength of light that has a frequency of 7.6 x 10^29 Hz. The speed of light is 3.0 x 10^8 m/s.
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10/05/22

what is the answer?
A 33.02 g sample of a substance is initially at 27.8 °C. After absorbing 1905 J of heat, the temperature of the substance is 107.8 °C. What is the specific heat (𝑐) of the substance?𝑐=
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10/05/22

what is the answer?
Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 18.0 atm. Calculate the work, 𝑤, if the gas expands against a constant external pressure of 1.00 atm to a final... more
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10/05/22

what is the answer?
If a system has 375 kcal of work done to it, and releases 5.00×102 kJ of heat into its surroundings, what is the change in internal energy (Δ𝐸 or Δ𝑈) of the system?Δ𝐸=
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10/05/22

what is the answer?
A system does 586 kJ of work and loses 296 kJ of heat to the surroundings.What is the change in internal energy, Δ𝐸, of the system? Note that internal energy is symbolized as Δ𝑈 in some sources.Δ𝐸=
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10/05/22

What mass of precipitate (in g) is formed when 70.0 mL of 0.500 M AlI₃ reacts with excess AgNO₃ in the following chemical reaction? AlI₃(aq) + 3 AgNO₃(aq) → 3 AgI(s) + Al(NO₃)₃(aq)
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