05/06/21

How many molecules of hydrogen chloride gas are in 1.5 x 10-3 hectoliters of the substance at STP?
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05/06/21

The freezing point of an aqueous solution with NaCl is -0.20 C. Calculate the molality concentration of the solution.
please, help me how to get its freezing point
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05/06/21

Calculate the amount of heat required to vaporize 75 g of water at 75 Celsius
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05/06/21

If there are 1.4 x 103 mg of chlorine gas at STP, how many liters does this occupy?
Struggling with this question
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05/06/21

The equilibrium system between hydrogen gas, bromine gas,

The equilibrium system between hydrogen gas, bromine gas, and hydrogen bromide gas is given. H2(g)+Br2(g)↽−−⇀ 2HBr(g) Write the balanced chemical equation for the reverse reaction. Include... more
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05/06/21

Write the equilibrium‑constant expression for the reaction A(s)+3B(l)↽−−⇀2C(aq)+D(aq)

Write the equilibrium‑constant expression for the reaction A(s)+3B(l)↽−−⇀2C(aq)+D(aq) in terms of [A], [B], [C], and [D], as needed. Note that 𝐾c, which is sometimes symbolized as ... more
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05/06/21

Write the equilibrium‑constant expression for the reaction shown in terms
Write the equilibrium‑constant expression for the reaction shown in terms of [A], [B], [C], and [D]. A(g)+B(g)↽−−⇀2C(g)+D(g) Note that 𝐾c, which is sometimes symbolized as 𝐾 or 𝐾eq,... more
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05/06/21

For the reaction 2NH3(g)↽−−⇀3H2(g)+N2(g)

For the reaction 2NH3(g)↽−−⇀3H2(g)+N2(g) the equilibrium concentrations were found to be [NH3]=0.250 M, [H2]=0.340 M, and [N2]=0.750 M. What is the equilibrium constant for this reaction?... more
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05/05/21

Enter your answer in scientific notation. Be sure to answer all parts. Calculate [H3O+] for a solution of nitric acid that is: pH = 5.46
Enter your answer in scientific notation. Be sure to answer all parts.   Calculate  [ H3O+ ]  for a solution of nitric acid that is:   pH = 5.46
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05/05/21

how many moles are present in 11.0 L of neon gas at stp
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05/05/21

Please help me with these Chemistry questions.

Metal alloys are materials used for building strong, sturdy structures; however, exposure to outside elements over time can weaken them. Explain WHAT happens and HOW this happens.How can we... more
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05/05/21

Please help me with these Chemistry questions.

When calcium and chlorine react to form calcium chloride, which substance is reduced?a, there is not enough informationb. calcium chloridec. calciumd, chlorineWhat happens to the oxidation number... more
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05/05/21

A rigid metal tank contains helium gas. Which applies to the gas in the tank when some helium is removed at constant temperature?

the average distance between the gas molecules decreasesthe total number of gas molecules remains the samethe volume of the gas decreasesthe pressure of the gas decreasesthe average speed of the... more
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05/05/21

In a Ag/Cu Galvanic cell, Ag(s) and Cu(s) electrodes were placed in a solution with 0.50 M Ag^+ and 0.50 M Cu^2+. What can be concluded about the cell potential?
In a Ag/Cu Galvanic cell, Ag(s) and Cu(s) electrodes were placed in a solution with 0.50 M Ag+ and 0.50 M Cu2+. What can be concluded about the cell potential?The cell potential is the same as the... more
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05/05/21

A voltaic cell contains one half-cell with zinc electrode in a Zn^2+(aq) solution and a copper electrode in a Cu2+(aq) solution.
A voltaic cell contains one half-cell with zinc electrode in a Zn2+(aq) solution and a copper electrode in a Cu2+(aq) solution. At standard conditions, E° = 1.10 V. Which condition below would... more
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05/05/21

An electrochemical cell is created with the following setup... What is the E of this cell?
An electrochemical cell is created with the following setup: K|K+(1.88M)||Cr3+(0.054M)|Cr What is the E of this cell?
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05/05/21

Calculate the number of moles of solute in 67.53 mL of 0.1655 M K2Cr2O7(aq).

Calculate the number of moles of solute in 67.53 mL of 0.1655 M K2Cr2O7(aq).
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05/05/21

Chemistry Mole Calculations
What is the volume in liters (at STP) of 6.02 x 10 (24.... avogadros number sorry cant make the 24 a tiny exponent) atoms of helium gas?
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05/05/21

HELP Chemistry. energy required to heat
At 1 atm, how much energy is required to heat 53.0 g H2O(s) at −22.0 ∘C to H2O(g) at 119.0 ∘C? In KJ.
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05/05/21

Vapor pressure of a certain liquid
A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 206.0 Torr at 45.0 ∘C.a. Calculate the value of delta H vap for this liquid.b. Calculate the normal boiling point of this liquid.
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05/04/21

Finding moles of Pb2+ from a solution of Pb(NO3)2
When 25.0mL of 0.05M Pb(NO3)2 are mixed with 35.0mL of 0.01M KI, a yellow precipitate of PbI2(s) forms.a. How many moles of Pb2+ are initially present? b. How many moles of I- are initially... more
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05/04/21

Given the following overall reaction and half cell reactions, we can predict that, for the reaction as written

Cl2(g) + 2Br- (aq) → 2Cl- (aq) + Br2(g) Cl2(g) + 2e- → 2Cl- E° = 1.36 V Br2(g) + 2e- → 2Br- E° = 1.09 Vwhat about Delta G
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05/04/21

What would decrease the solubility of PbI2?
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05/04/21

How to balance an equation
A buffer is preparing a solution by using 30 mL of 0.15 M NaF, with 30 mL of 0.2 M HF. Ka of HF is 6.6 x 10-4a.) A small amount of 3 M H2SO4 is added to the buffers solution and the pH becomes... more
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05/04/21

need help with the preparation of potassium iodate for a titration of thiosulfate
I want to prepare a ca. 0.02M solution of Potassium iodate to react with 20-30mL of 0.1M Sodium Thiosulfate (Na2S2O3.5H2O), the volume required is 250mL, I know I will be required to add... more
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