03/31/23

Colligative properties

Solvent water freezing point 0 degrees Celsius, Kf 1.86 boiling point 100 degrees Celsius, Kb 0.512, vapor pressure 2.33kpa1) 5.7 grams of calcium bromide are dissolved in 50.0 mL of water.... more
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03/31/23

Chemistry question

Compare unsaturated, supersaturated, and saturated solutions.
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03/30/23

Which of the following chemical equations shows how NaC2H3O2 produces a basic (alkaline) solution?
A 0.10 M NaC2H3O2 (sodium acetate) solution in water has a pH of 8.4. Sodium acetate dissolved in water produces sodium ions and acetate ions. The acetate ion, C2H3O2-, is the conjugate base of... more
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03/30/23

Calculate the pKa of HA
A buffer is prepared by adding 25 mL of 0.10 M HA ( a weak acid) to 15 mL of 0.10 M NaA (the salt of its conjugate base). The measured pH of the buffer is 3.48. Calculate the pKa of HA. (Hint: Use... more
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03/30/23

Solid Precipitate/ Excess Reactant Chem Question
If a solution containing 27.24 g of mercury(II) acetate is allowed to react completely with a solution containing 8.564 g of sodium dichromate, how many grams of solid precipitate will form?
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03/30/23

The partial pressure of CH4(g) is 0.175 atm and that of O2(g) is 0.250 atm in a mixture of the two gases. What is the mole fraction of each gas in the mixture?
The partial pressure of CH4(g) is 0.175 atm and that of O2(g) is 0.250 atm in a mixture of the two gases. What is the mole fraction of each gas in the mixture?
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03/30/23

If 4.000 grams of hydrogen peroxide is placed within a sealed 250.0 mL container at 500.0 K. What is the pressure of the oxygen gas produced in atmosphere?
If 4.000 grams of hydrogen peroxide is placed within a sealed 250.0 mL container at 500.0 K. What is the pressure of the oxygen gas produced in atmosphere?
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03/30/23

A 50.0 L sealed cylinder contains 100.0 moles of helium gas. Its pressure at 273.0 K is 44.8 atm. What is the pressure when the gas is heated to 500.0 K.

A 50.0 L sealed cylinder contains 100.0 moles of helium gas. Its pressure at 273.0 K is 44.8 atm. What is the pressure when the gas is heated to 500.0 K.
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03/30/23

The steam reforming of methane occurs according to the following chemical equation:
CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g) Use the following equations to solve for the enthalpy change of steam reforming of methane: H₂(g) + ½O₂(g) → H₂O(g) ∆H° = -242 kJ/mol 2H₂(g) + C(s) → CH₄(g) ∆H°... more
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03/30/23

Using the equations
2 Fe (s) + 3 Cl₂ (g) → 2 FeCl₃ (s) ∆H° = -800.0 kJ/mol Si(s) + 2 Cl₂ (g) → SiCl₄ (s) ∆H° = -640.1 kJ/mol Determine the molar enthalpy (in kJ/mol) for the reaction 3 SiCl₄ (s) + 4 Fe (s) → 4 FeCl₃... more
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03/30/23

For the chemical reaction Ca (s) + ½ O₂ (g) → CaO (s) ∆H° = -635 kJ/mol. What is the molar enthalpy (in kJ/mol) for the reaction 2 CaO (s) → 2 Ca (s) + O₂ (g)?
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03/30/23

In the following reaction, what quantity in moles of CH₃OH are required to give off 1501 kJ of heat? 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) ∆H° = -1280. kJ
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03/29/23

A hot lump of 26.5 g of copper at an initial temperature of 77.0 °C is placed in 50.0 mL H2O initially at 25.0 °C and allowed to reach thermal equilibrium.
A hot lump of 26.5 g of copper at an initial temperature of 77.0 °C is placed in 50.0 mL H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the... more
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03/29/23

Based on the sign of the standard cell potential, E°cell, classify these reactions as spontaneous or nonspontaneous as written
Based on the sign of the standard cell potential, E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions. Refer to the list of standard reduction... more
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03/29/23

What is the standard potential of a galvanic (voltaic) cell where X is the anode and Y is the cathode?
Consider these two entries from a fictional table of standard reduction potentials.X^3+ + 3e−⟶X(s) E°= −1.78 VY^3+ + 3e−⟶Y(s) E°= −0.23 VWhat is the standard potential of a galvanic (voltaic) cell... more
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03/29/23

Calculate the standard potential for this cell at 25∘C
A galvanic (voltaic) cell consists of an electrode composed of titanium in a 1.0 M titanium(II) ion solution and a second electrode composed of tin in a 1.0 M tin(II) ion solution, connected by a... more
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03/29/23

Calculate the standard potential for this cell at 25°C
A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M titanium(III) ion and 1.0 M titanium(II) ion, and another inert platinum electrode in a solution... more
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03/29/23

Calculate the standard potential for this cell at 25 °C
A galvanic (voltaic) cell consists of an electrode composed of zinc in a 1.0 M1.0 M zinc ion solution and another electrode composed of silver in a 1.0 M1.0 M silver ion solution, connected by a... more
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03/28/23

ASAP Step by step I really am not understanding how to solve this problem

If 10 g of oxygen gas is in a 2.00 L container at 50 Cwhat is the pressure in the container ? Round to one decimal place.When the temperature of a rigid hollow sphere containing 685 L of helium gas... more
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03/28/23

Calorimetry....
Calculate the final temperature of the system: A 50.0 gram sample of water initially at 100 °C and a 100 gram sample initially at 2.86 °C are mixed. The specific heat of water is 4.184 J/g°C.
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03/28/23

Calorimetry.....
A sample of gas is placed into an enclosed cylinder and fitted with a movable piston. Calculate the work (in joules) done on the gas if it is compressed from 15.43 L to 8.56 L with a pressure of... more
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03/28/23

Calorimetry....
A sample of flammable liquid is placed into an enclosed cylinder which is then fitted with a movable piston. Initially the cylinder contains a volume of 7.30 L. The sample is ignited producing gas... more
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03/28/23

How many litres of O2 will be produced at a temperature of 37 degrees Celsius and 1520 torr if 2 moles of KCIO3 decompose according to the following balanced equation?
How many litres of O2 will be produced at a temperature of 37 degrees Celsius and 1520 torr if 2 moles of KCIO3 decompose according to the following balanced equation?2KCIO3 -> 2KCI + 3O2
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03/28/23

Oxyacetylene torches are used for welding at temperature close to 200°C.These temperatures are due to combustion of acetylene with oxygen.
Oxyacetylene torches are used for welding at temperature close to 200°C.These temperatures are due to combustion of acetylene with oxygen.C2H2 (g) + O2 (g) -> CO2 (g) + H2O (g)a) Balance the... more
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03/28/23

Chemistry chemical reactions
A reaction vessel contains 7.10 g of CO and 7.10 g of O2. How many grams of CO2 could be produced according to the following reaction?2CO+O2​2CO2​
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