04/28/21

Graphical Method: Order and k from Slope and Intercept
In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °CNH4NCO(aq)(NH2)2CO(aq)the concentration of NH4NCO was followed as a function of time.It was found that a... more
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04/28/21

Kp with Initial and Equilibrium Pressures
A student ran the following reaction in the laboratory at 692 K:H2(g) + I2(g) 2HI(g)When she introduced H2(g) and I2(g) into a 1.00 L evacuated container, so that the initial partial pressure... more
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04/28/21

Kₐ: Calculate from pH
In the laboratory, a general chemistry student measured the pH of a 0.533 M aqueous solution of acetylsalicylic acid (aspirin), HC9H7O4 to be 1.883.Use the information she obtained to determine the... more
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04/28/21

ΔG° = ΔH° - TΔS°
For the reactionH2S(g) + 2H2O(l)3H2(g) + SO2(g)H° = 295.4 kJ and S° = 294.7 J/KThe standard free energy change for the reaction of 2.28 moles of H2S(g) at 325 K, 1 atm would be _____ kJ.This... more
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04/28/21

Electrochemical Cells: Components and Reactions
A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt bridge.Cl2(g) + Hg(l)  2Cl-(aq) + Hg2+(aq)The anode reaction... more
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04/28/21

chemistry question
Given that~H2(g)+F2(g) 2H2(g)+O2(g) ⟶ 2HF(g). ~Δ𝐻∘rxn=−546.6 kJ⋅mol−1~2H2(g)+O2(g)⟶ 2H2O(l)~Δ𝐻∘rxn=−571.6 kJ⋅mol−1calculate the value... more
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04/27/21

Determine K for a reaction at 200 K if ∆G° =19.7 kJ/mol. (R = 8.314 J/mol ･ K)
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04/27/21

Half Reaction: Balance H2O and OH-
When the following half reaction is balanced under basic conditions, what are the coefficients of the species shown? _____SnO32- +  _______H2O   ______SnO22- +  ______OH-In the above half reaction,... more
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04/27/21

Thorium-236 has a half life of 10.0 minutes. If I have 250 grams of Thorium-236, How many half lives will have taken place after 50.0 minutes?
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04/27/21

What are the products of SrSO4 + Na3P -> ?

also what would it be balanced?
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04/27/21

How much heat in Joules would it take to melt 2.45 g of ice at 0.0OC and then raise the temperature of the water to 75.0OC?
A- 820 JB- 768 JC- 1000 JD- 1588 J
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04/27/21

(is this correct)
At 25°C, aqueous solutions with a pH of 6 have a hydroxide ion concentration, [OH-], of 1 M 1 x 10-6 M 1 x 10-8 M 1 x 10-14 M (is this correct)
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04/27/21

Chapter 9 Test Review
If a radio wave has a frequency of 7.25 x 105 Hz, what is its wavelength?  Please show you work so I understand.
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04/27/21

The acid-dissociation constants of HC3H5O3 (aq) and CH3NH3+ (aq) are given in the table above. Which of the following mixtures is a buffer with a pH of approximately 10.5?
Given:HC3H5O3--> Ka: 8.3*10^-4CH3NH3+---> Ka: 2.3*10^-11 The acid-dissociation constants of HC3H5O3 (aq) and CH3NH3+ (aq) are given in the table above. Which of the following mixtures is a... more
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04/27/21

For which acid is the value of the acid-dissociation constant, Ka , the smallest?
Concentration (M) pH of Acid 1 pH of Acid 2 pH of Acid 3 pH of Acid 4 0.010 3.44 2.00 2.92 3.86 0.050 3.09 1.30 2.58 3.51 0.10 2.94 1.00 2.42 3.11 0.50 2.69 (after this is 2.44) 0.30... more
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04/27/21

200. mL of Ca(OH)2 are required to neutralize 100. mL of 0.10 M Acetic acid. What is the molarity of the Ca(OH)2
200. mL of Ca(OH)2 are required to neutralize 100. mL of 0.10 M Acetic acid. What is the molarity of the Ca(OH)2
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04/26/21

Mixture of gases w/ 1.32g of CO, 1.61g of N2, and 8.77g of SO2. What is the partial pressure in atm of each component if held in a 16.6-L vessel at 37.5 oC? R = 0.0821 L-atm/mol-K for gas constant.
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04/26/21

Calculate the density of sulfur hexafluoride gas at 261 oC and 352 torr. Use R = 0.0821 L-atm/mol-K for the value of the gas constant.
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04/26/21

Help please I hate chem
In the synthesis of water from its elements, what is the total number of grams of oxygen gas needed to produce 54 grams of water?
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04/26/21

find the pH of the following solution
a. 1x10^-3 HCLb. 6x10^-9 Potassium Hydroxide
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04/26/21

What is a net ionic equation? What species are shown in such an equation, and which species are not shown?
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04/26/21

what is the Net Ionic Equation for Aqueous ammonium chloride and aqueous lead (II) nitrate react to form solid lead (II) chloride and aqueous ammonium nitrate.

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04/26/21

chemical quantities
A compound contains C, H, and F in a 1:2:2 ratio.  Determine the empirical formula. If the actual molar mass is 208 g/mol, what is the molecular formula?
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04/26/21

Draw the Lewis structure for BrF
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
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04/26/21

Calculate the equilibrium constant for the following reaction at 25 °C, given that ΔG°f(H2O(l)) = -237.2 kJ/mol and R = 8.314 J/mol•K
2H2O(l)  ⇌ 2H2(g) + O2(g)
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