04/04/20

 the Questions are in the description Please help
 1)A sample of gas at 4407.73 mmHg inside a steel tank is cooled from 514 degrees C to 8.3 degrees C What is the final pressure of the gas in the steel tank?2)P1 = 772 torr; T1 = 10 degrees C; P2 =... more
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04/03/20

How to Balance K2CO3 + CaCl2 = CaCO3 + KCl (Potassium carbonate + Calcium chloride)
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04/03/20

Calculate the energy (J) of the photon emitted when an electron in the hydrogen atom falls from n=5 to n=3. Use 2.178 E-18 J for the constant in the Bohr Equation. Answer should be 4 sig figs , SN
There is a part 2 to this questions Calculate the wavelength (m) of the light emitted during the transition from n=5 to n=2 .Hint, first calculate the energy as you did in the previous... more
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04/03/20

what is the theoretical yield and percent yield?
 When 50.5 grams of KMnO4 is used, what is the theoretical yield of MnCl2? If only 36.2 grams of MnCl2 are obtained, what is the percent yield?
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04/03/20

How to calculate concentrations at equilibrium
A solution is formed by mixing 50.0 mL of 11.2 M NaX with 50.0 mL of 2.0 10-3 M CuNO3? Assume that Cu+  forms complex ions with  as follows:Cu+(aq) + X -(aq)<--> CuX(aq) K1 = 1.0 102CuX(aq) +... more
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04/03/20

Heat energy released (thermochemistry)
When methanol, CH3OH is burned in the presence of oxygen gas, O2, a large amount of heat energy is released, as shown in the combustion reaction. CH3OH(g) + 3/2 O2(g) —> CO2(g) + 2H2O(l)^H=-764... more
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04/03/20

Copper metal can be produced by heating copper(II) oxide and hydrogen gas (and other product of the reaction is water)
If the enthalpy of reaction () for this reaction is +130.5 kJ, calculate the heat of reaction for producing 2.0 g of copper metal.
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04/03/20

What is the subshell corresponding to the following sets of quantum numbers? An example of how to write your answer is 2s.

n= 5, l=4 n=5, l=3
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04/02/20

A 24.9 mL sample of 0.227 M ethylamine, C2H5NH2, is titrated with 0.321 M perchloric acid.
A 24.9 mL sample of 0.227 M ethylamine, C2H5NH2, is titrated with 0.321 M perchloric acid.(1) At the titration midpoint, the pH is . (2) At the equivalence point, the pH is . 
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04/02/20

themo chemistry
 What is the change in temperature when 3.00 grams of calcium chloride is dissolved in 100 mL of water?  5.19oCGiven the change in the temperature from adding 3.00 grams of calcium chloride to... more
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04/02/20

How many grams of Br2 are needed to form 66.1 g of AlBr3

66.1 g AlBr3 write in conversion to calculate the grams of Br2
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04/02/20

You have 0.100 mol of H atoms in the ground state. How much energy is required to transition all of the atoms from the ground state to n=2?
This also has a follow up questions after which is What is the frequency of the light required to make this transition?
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04/02/20

the molar mass of the unknown gas is?
A sample of N2 gas is observed to effuse through a porous barrier in 7.96 minutes. Under the same conditions, the same number of moles of an unknown gas requires 10.9 minutes to effuse through the... more
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04/02/20

the pressure will decrease b/c ?
A 0.948 mol sample of Kr gas is confined in a 23.5 liter container at 29.3 °C.If the volume of the gas sample is increased to 47.0 L, holding the temperature constant, the pressure will decrease.... more
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04/02/20

the pressure will decrease because?
A 0.697 mol sample of O2 gas is confined in a 16.5 liter container at 15.0 °C.If the temperature of the gas sample is decreased to -4.60 °C, holding the volume constant, the pressure... more
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04/02/20

how many grams of iron are needed to produce
How many grams of iron are needed to produce 36.4 L of hydrogen gas according to the following reaction at 25 °C and 1 atm?iron (s) + hydrochloric acid(aq)iron(II)... more
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04/02/20

Using mass concentration to find solute mass and solution volume
Calculate the volume in liters of a /14.9gdL sodium carbonate solution that contains 443.g of sodium carbonate Na2CO3. Round your answer to 3 significant digits. answer in liter
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04/02/20

Advanced Material Topic Name Solving applied mass concentration problems
GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect normal levels of dissolved serum iron (65. to 170./μgdL), using a blood... more
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04/02/20

Rate of Reaction
2KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2KNO3(aq)The concentration of Pb(NO3)2 is 0.849 M at the start of the reaction, and 0.535 M after 65 seconds. The initial concentrations of the products are... more
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04/02/20

According to the following balanced reaction, how many grams of NO are formed from 388 grams of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) (Please help Urgent)

Formula: 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
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04/02/20

Determine the number of moles of 2.6 g of angelic acid
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04/01/20

Which one of the following processes is NOT chemical in nature? Exploding fireworks, Dry ice subliming, Forming of water from hydrogen and oxygen, Curdling milk, Sugar burning
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04/01/20

What temperature would a 2m water solution of CaCl2 boil at? (SW) Kb water is .52 BP water is 100oC ATb = (i)(kb)(m)
 What temperature would a 2m water solution of CaCl2 boil at?  Kb water is .52    BP water is 100oC     ATb = (i)(kb)(m)
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04/01/20

Given the following information: 2NO(g)==> N2(g)+O2(g) ^H= -180.6 kj , N2(g)+O2(g) + CI2(g)==>2NOCI(g). , ^H = +103.4 kj. Find the ^H of the following reaction: 2NOCI(g)==>2NO(g)+CO2(g)
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04/01/20

The reaction in hand warmers is 4Fe(s)+3O2(g)==>2Fe2O3(s) ^H= -1652kj calculate the amount on energy released by a hand warmer that contains 1.25 g of Fe(s)
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