10/07/24

Copper (I) Chloride Reaction Sequence
Copper (I) chloride is prepared from metallic copper, through a series of chemical reactions. In the lab one will make copper(II), remove the excess oxidizing agent (nitrate ion), and then reduce... more
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10/03/24

How do i find the percent yield?
Gaseous butane (CH3(CH2)2CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 5.23 g of butane is mixed with 33.g of oxygen. Calculate... more
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10/02/24

A gold block initially at 62.9°C is put into 120 grams of H2O at 25.8°C in a container. The mixture at thermal equilibrium reached a temperature of 28.3°C. What is the mass of gold used?
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09/29/24

Equilibrium at Certain Temperatures
The Keq for the reaction 2 HI(g)  H2(g) + I2(g) has a value of 1.85 x 10-2 at 425°C. If 0.18 mol of HI is placed in a 2.0 L flask and allowed to come to equilibrium at this temperature, what will... more
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09/28/24

Introduction to Spectrochemical Methods
Calculate the wavelength and the energy in joules associated with a signal at 220 MHz.
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09/28/24

Describe the differences between “real” deviations from Beer’s law and those due to instrumental or chemical factors.
I need quick response Introduction to Spectrochemical Methods
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09/27/24

The specific heat of water is 4.184J/g°C. How many joules of heat will be removed from 2.00 g of water when its temperature drops by 20°C?
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09/25/24

Equilibrium Calculations
 0.2000 mol each of SO2, O2 and SO3 is placed in a 2.000 L flask and allowed to come to equilibrium. The equilibrium [SO2] is found to be 0.0040 mol/L. What is the value of Keqfor the reaction?2... more
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09/21/24

Chemistry Quarter Thickness in mm
A quarter is a coin that contains 91.6% by mass copper and 8.33 % by mass nickel. It has a diameter of0.955 inches and density of 7.01 g/cm3. If a single quarter contains 0.183 ounces of copper,... more
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09/19/24

Chemistry dealing with yields

Attempting to make barium phosphate by precipitation when mixing solutions of barium chloride and trisodium phosphate: 3 BaCl2 (aq) + 2 Na3PO4 (aq) → Ba3(PO4)2 (s) + 6 NaCl(aq) 208.33 ... more
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09/19/24

at a certain temperature, 0.351 mol CH4, a d 0.690 mol H2S are placed in 3.50 L container. CH4+2H2S<->CS2+4H2 at equilibrium, 13.9g CS2 is present. Calculate Kc.
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09/18/24

how many grams of NH3 are needed to provide the same number of molecules as in .5 g of SF6
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09/18/24

Broken calorimeter
You have a slightly broken calorimeter. You combust a 10.0g standard that releases exactly 60 kcal of heat inside of the calorimeter filled with 1050 mL of H2O. You measure the initial temperature... more
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09/17/24

determine the molar solubility of copper (I) azide (CuN3) in a solution with a ph of 3.793. Ignore activities. The Ksp for CuN3 is 4.9x10^-9. The Ka for HN3 is 2.2x10^-5
Use systematic treatment of equilibrium
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09/15/24

A 11.294 g sample of an unknown hydrate of cobalt(II) bromide is heated until all the water of hydration is removed. The CoBr2 that remains has a mass of 8.0000 g.
How many moles of CoBr2 are in the sample? How many grams of water were lost in the dehydration? How many moles of water were lost? What is the value of "n" in the formula CoBr2 · n H2O? (1, 2, 3,... more
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09/13/24

How many atoms are in .405g of P2O5
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09/11/24

How many atoms of 6Li are there in 12.8 g of 6Li?
How many atoms of 6Li are there in 12.8 g of 6Li?
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09/07/24

Regarding electrons and their quantum numbers
1. What would be the maximum number of electrons in a given atom that can occupy each of the following?(a) n = 3 shell (c) 2p orbital(b) 2pz orbital (d) 2d orbital2. How many electrons in a given... more
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09/07/24

Regarding the recrystallization of benzoic acid
Why is water a good solvent for the recrystallization of benzoic acid? If charcoal and sugar were present in crude benzoic acid, would recrystallization from water be a good method of... more
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09/06/24

A technical machinist is asked to build a cubital steel tank that will hold 185 L of water. Calculate in meters the smallest possible inside length of the tank. Round your answer to the nearest 0.01 m
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09/03/24

3. If 25.5 g H2 are made to react with 64.2 g N2, what is the limiting reagent? 3H2(g) + N2(g) → 2NH3(g)
3. If 25.5 g H2 are made to react with 64.2 g N2, what is the limiting reagent? 3H2(g) + N2(g) → 2NH3(g)
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08/28/24

the change in heat (q) when 30 grams of copper melt.

Determine the change in heat (q) when 30 grams of copper melt. ( Lf = 205 J/g     Lv = 4807 J/g )
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08/23/24

Ap Chemistry Crucible lab
A student heats up a crucible and in the end after doing the math, the hydrate is 1.51 g, the dehydrate is 0.98 g and the water lost is 0.53g. This needs to be converted into moles of Copper (II)... more
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08/16/24

Physics 1 question on finding density of copper cube
A copper cube with density 8.96 ✕ 103 kg/m3 and mass 20.0 kg at 29.0°C is heated to 150°C.What is the density of the copper cube at this new temperature? (Give your answer to at least three... more
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08/05/24

Setting up a unit reprefix conversion
(0.030 N/cm) x ? =? N/mm
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