450 Answered Questions for the topic chem

02/15/21

At a certain temperature, an equilibrium mixture in a 1.00 L container consists of 0.245 M H2(g), 0.199 M I2(g), and 1.563 M HI(g).

(a) Calculate KC for H2(g) + I2(g) ⇌ 2HI(g); (b) An additional 0.500 mol of H2(g) is added to the container. Calculate the new equilibrium concentrations.
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02/15/21

At 600 K, 0.250 mol N2(g) and 0.270 mol H2(g) were placed in a 2.00 L container. At equilibrium, the concentration of NH3(g) was 0.030 M. Calculate KC at 600 K for N2(g) + 3H2(g) ⇌ 2NH3(g).
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02/15/21

At 700 K, an equilibrium mixture of gases was found to contain 0.0215 M H2, 0.00158 M I2, and 0.0487 M HI. Calculate KC for H2(g) + I2(g) ⇌ 2HI(g) at 700 K.
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02/15/21

At 377 °C, KC = 0.0111 M for PCl5(g) ⇌ PCl3(g) + Cl2(g).

At 377 °C, KC = 0.0111 M for PCl5(g) ⇌ PCl3(g) + Cl2(g). Into a 2.00 L flask are placed 0.120 mol PCl5, 0.0600 mol PCl3, and 0.0400 mol Cl2. Are the contents of the flask at equilibrium? If not,... more
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02/09/21

2 moles of Sodium sulfate is reacted with 3 moles of calcium chloride.  
2 moles of Sodium sulfate is reacted with 3 moles of calcium chloride.   Write a balanced chemical equation, including states of all reactants and products. Write a net ionic equation. Determine... more
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02/08/21

Which of the following solutions would have the lowest freezing point?
a. 0.10 M lithium chlorideb. 0.15 M barium nitratec. 0.20 M potassium iodided. 0.25 M sodium nitratee. 0.20 M calcium bromide
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02/07/21

General Chemistry
What is the final sodium ion concentration when 35.0 ml of 0.150 M NaCl is mixed with 75.0 of 0.050 M Na2SO4 and 20.0 ml of 0.100 M KCI?
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02/07/21

General Chemistry
What volume of CO2 gas is produced when 5.00 kg of pure iron metal is formed and the gas volume is measured at 10.0 atm and 450 degree C?
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02/07/21

General Chemistry
what is the molarity of a solution made by dissolving 12.5 grams of potassium chromate in enough water to form 225 ml of solution?Then give the molarity for the cation.Please include steps
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02/06/21

General Chemistry
35.0 ml of a 1.25 sodium hydroxide solution is diluted with water to a final volume of 55.0 ml. What is the new molarity?
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02/06/21

General Chemistry
What volume of 0.350 M sodium iodide could be prepared with 50.0 grams of the pure solid? Include steps please.
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Chem Chemistry

01/28/21

Calculate the heat energy released when 16.8 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
Constants for mercury at 1 atmheat capacity of Hg(l) 28.0 J/(mol⋅K)melting point 234.32 Kenthalpy of fusion2.29 kJ/mo
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01/25/21

Please help with Chemistry Question!
Consider the reaction of hydrogen and oxygen producing water. If 26.1 g of water is produced and 23.0 g of oxygen is used how many grams of hydrogen are needed?
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01/24/21

Given N2H4 + 7H2O2 → 2HNO3 + 8H2O.
4. Given N2H4 + 7H2O2 → 2HNO3 + 8H2O. If the rate of appearance of HNO3 is 0.026 M·min−1 , what is the rate of disappearance of H2O2? What is the rate of change of H2O2?5. For the reaction of... more
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Chem Chemistry

01/15/21

How does the vapor pressure of a solution compare with the vapor pressure solvent A in the pure state if the solute is more volatile than the solvent?
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Chem Chemistry

01/15/21

How does the vapor pressure of solvent A in a solution compare with the vapor pressure of solvent A in the pure state? Does it matter whether solute B is volatile or nonvolatile?
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01/13/21

Why is the lewis structure of H2S bent at an angle but not linear?
Why is the lewis structure of H2S bent at an angle but not linear? When I drew the lewis structure, I drew the two hydrogens at a an 180 degree angle with sulfur in the middle. How do I distinguish... more
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01/12/21

Question about vapor pressure
A flask containing nothing other than air at 100.0 kPa is filled partway with water and then sealed and left to sit at 20C. The total pressure of a mixture of gases is equal to the sum of the... more
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01/11/21

Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:
Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:a) HCIb) H2c) H2Od) NH3e) CCI4f) CO2e) HBr
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01/10/21

A 5.431 m formic acid (HCO2H) solution in water has a density of 1.047 g/mL. Find the molarity of the solution and the percent by mass and mole fraction of formic acid
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Chem Chemistry

01/10/21

A solution is made by dissolving solute B in solvent A. Consider the A-A attractive forces, the B-B attractive forces, and the A-B attractive forces.
If the solution process is exothermic, what can you say about the relationships between these attractive forces?
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01/09/21

plz convert these URGENT

1. How many molecules in a sample of NaClO with a mass of 3.90g. 2. 2.4g of CO2 would have how many Oxygen atoms.3. 1.63 x 10^22 molecules of CH3COONa to grams4. 3.6g AlPO4 to moles5. 2.4g Na2SO4... more
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01/05/21

Formula of Copper(II) Sulfate Hydrate Lab

Data: Mass of empty dish: 50.58 gmass of crystals and dish: 55.63mass of crystals after first heating: 54.57mass of crystals after second heating: 53.82mass of crystals after third heating:... more
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Chem Chemistry

12/08/20

please help me out

A farmer has been using calcium for decades to help maintain chemical balance in the soil used to grow his crops. Unfortunately, the farmer's calcium supplier has been steadily increasing the price... more
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Chem Chemistry

12/08/20

please help me please
A student is studying a mystery element and observes two distinct bands in the element's emission spectrum (shown below). One band appears at a wavelength of 450 nm while the other appears at a... more
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