03/01/22

entalphy chemistry

Lead has a melting point of 327.5 °C, its specific heat is 0.128 J/g⋅°C, and its molar enthalpy of fusion is 4.80 kJ/mol. How much heat, in kilojoules, will be required to heat a 500.0 g sample of... more
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03/01/22

Solutions of silver nitrate and aluminum iodide are mixed together, forming solid silver iodide and aqueous aluminum nitrate.
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03/01/22

Assume that 16.13 mL of 0.186 M NaOH is used to titrate 0.300 g of an unknown acid. Calculate the equivalent weight of the acid.
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02/28/22

What is the rate of the reaction.
Consider the following reaction: BrO3- + 5Br + 6H+ ===> 3Br2 + 3H2OThe rate law was experimentally determined and found to be Rate= k[BrO3-][Br][H+]2What is the overall order of the reaction? (I... more
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02/28/22

Br2, CI2, and I2 will dissolve into what?
In part B, you will create a layer of hexane and a layer of water in a test tube. The two do not mix readily, and the halogens (X2) added to the test tube will separate into the non-polar hexane... more
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02/28/22

The two do not mix readily, and chemicals added to the test tube will separate into the hexane layer and the water layer depending on the polarity of the added chemical. Which layer will be on top?
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02/26/22

How many moles of Aluminum chloride are produced from 8.9 moles of HCl
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02/26/22

What are the reaction rate expressions for each reaction?
What are the reaction rate expressions for each reaction? H2(g) + I2(g) —> 2HI(g) 2H2(g)+ o2(g) —> 2H2o(g)
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02/26/22

How many grams are in N2 if there are 16.8 grams in NH3?
There is a chemical equation that says 4 NH3 + 6NO = 5N2 + 6H2O
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02/25/22

How many molecules of each reactant are remain after the reaction is complete? What is the limiting reactant? How many molecules of NH3 are produced?
Nitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia.N2 (g) + 3H2 (g) = 2NH (g)There are four molecules of nitrogen and nine molecules of hydrogen... more
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02/25/22

How much fertilizer should someone apply to provide 2.40 g N to a plant?
A multi-nutrient fertilizer contains several different nitrogen containing compounds. The fertilizer is 54.0% CH4, N2, O (urea),22.6% KNO3, and 14.8% (NH4)2HPO4 by mass. The remainder of the... more
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02/25/22

What mass of CO, is generated from the combustion of 13.4 kg of the mixture?
A mixture of hydrocarbons contains 39.2% heptane, C7H16 11.3% nonane, C9H20, and 49.5% octane, C8H18- The mixture is combusted in an excess of oxygen. What mass of CO, is generated from the... more
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01/27/22

physical chemistry
A person was found to be contaminated by an organic pollutant X, and the level of X in his urine was 1.98 mg/dm3 . Pollutant X is eliminated by the body via a first order reaction and the... more
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12/01/21

From the standard molar enthalpy of combustion of pentane at 298 K, calculate the value of Δr A° for the process. (For this reaction, ΔrH° = −3508.8 kJ·mol−1 and ΔrS° = −416.1 J·K−1·mol−1.)
From the standard molar enthalpy of combustion of pentane at 298 K, calculate the value of Δr A° for the process. (For this reaction, ΔrH° = −3508.8 kJ·mol−1 and ΔrS° = −416.1 J·K−1·mol−1.)  kJ·mol−1
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11/29/21

4. A solution contains 0.100M Fe3+, 1.00×10−4M Fe2+, 1.00×10−4M Mn2+, 0.100 M MnO4-, and 1.00M HClO4. a) Write a balanced net reaction that can occur between...
4.        A solution contains 0.100M Fe3+, 1.00×10−4M Fe2+, 1.00×10−4M Mn2+, 0.100 M MnO4-, and 1.00M HClO4. a)     Write a balanced net reaction that can occur between species in this... more
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11/29/21

The cyanide ion selective electrode responds according to the equation: E=constant –0.05916log[CN-] The electrode potential was –0.230 V when it was immersed in a 1.00x...
The cyanide ion selective electrode responds according to the equation:                                         E=constant –0.05916log[CN-]The electrode potential was –0.230 V when it... more
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11/29/21

Consider the following reaction 3Cu(s) + 2NO3-(aq) + 8H+(aq)  3Cu2+(aq) + 2NO(g) + 4H2O(l) What is the cell potential if [Cu2+]=0.001M, [NO3-]=0.01M, [H+]=0.100M and PNO=0.0003 atm.
Consider the following reaction       3Cu(s) + 2NO3-(aq) + 8H+(aq) ®  3Cu2+(aq) + 2NO(g) + 4H2O(l)What is the cell potential if [Cu2+]=0.001M, [NO3-]=0.01M, [H+]=0.100M and PNO=0.0003 atm.
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11/29/21

What is the nuclear binding energy (in J) for a 56Fe nucleus?

The mass of a proton is 1.673 × 10-24 g. The mass of a neutron is The mass of the nucleus of an 56Fe atom is 9.286 × 10-23 g. 
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11/23/21

What is the potential of the electrode?

The selectivity coefficient, 𝐾K+,H+, for a K+ ion-selective electrode is 0.00394. When the electrode is placed into a 2.23×10−5 M K+ solution at pH 6.71, the potential is −0.160 V vs. SCE. If the... more
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11/10/21

What is the wavelength of light?
If the incident angle that light hits a grating is 48 o and the diffraction angle is 20 o, calculate the wavelength of light at n = 2. For the given grating d = 689.7 nm/groove and the grating has... more
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11/10/21

please help solve these

Calculate the magnitude 𝐿L of the orbital angular momentum, in multiples of,ℏ, of an electron in the atomic orbital 3𝑑.Consider a sample of sulfur atoms prepared in the absence of an external... more
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11/09/21

How many outliers are in the following data set? 167, 180, 188, 177, 181, 185, 189
How many outliers are in the following data set? 167, 180, 188, 177, 181, 185, 189
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11/08/21

Chemistry Homework
An aqueous solution of Ca(OH)2with a concentration of 0.206 M was used to titrate 25.00 mL of aqueous HCl. 11.73 mL of the Ca(OH)2was required to reach the endpoint of the titration.How many moles... more
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11/08/21

Chemistry Question

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water, the process can be expressed through the balanced equation below. determine the... more
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11/08/21

Iron is obtained by reaction of hematite (Fe2O3) with carbon monoxide. How many moles of CO2 is produced when 3.14 x 1024 atoms of hematite is used up in the reaction?
Fe2O3 + 3CO --> 2Fe + 3CO2
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