04/30/20

Chem help please?

Calculate the pH of a cathod compartment solution if the cell emf at 298k is measured to be 0.680 V when [Zn^2+]=0.33M and PH2=0.92atm
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04/30/20

Chemistry help please?

Under standard conditions what is the maximum electrical work in joules that the cell can accomplish if 67.0 g of Sn is consumed? A voltaic cell is based on the reactionSn(s)+I2(s)—>Sn^2+(aq) +... more
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04/29/20

How many atoms are there in 42 grams of NH3
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04/29/20

If I have 22 grams of H2O how many molecules do I have

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04/29/20

The statement is false and replace one word to make it true
The limiting reagent is used to calculate the actual yield.
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04/29/20

Endothermic or exothermic
Is this endothermic or exothermic and whyFeCl3 (aq) + KSCN (aq) > Fe(SCN)3 + 3KCl (aq)
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04/29/20

Mole to mole ratio stoichiometry
How many grams of zinc are needed to produce 20.8 grams of zinc chloride?
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04/29/20

what is the half-life in seconds?
A → B is a first order reaction. Using the data below, what is the half-life in seconds? 0 sec, [A] = 1.22 M 3 sec, [A] = 0.86 M 6 sec, [A] = 0.61 M 9 sec, [A] = 0.43 M 12 sec, [A] = 0.31 M 15 sec,... more
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04/29/20

Hydrogen fluoride (HF) has a lower boiling point than water (H2O), even though fluoride (F) has a greater electronegativity than oxygen (O). Why do you think that is?
Hydrogen fluoride (HF) has a lower boiling point than water (H2O), even though fluoride (F) has a greater electronegativity than oxygen (O). Why do you think that is?
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04/29/20

Why is water (H2O) a liquid at room temperature while carbon dioxide (CO2) is a gas? What’s different about their structures that results in very different properties?
Why is water (H2O) a liquid at room temperature while carbon dioxide (CO2) is a gas? What’s different about their structures that results in very different properties?
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04/29/20

If 1 mole of each of the solutes listed below is dissolved in 1 L of water, which solute will have the greatest effect on the vapor pressure of its respective solution?

Which is the correct answer?A) C6H12O6B) CaSO4C) KBrD) MgCl2
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04/29/20

Calculate the boiling point elevation of a solution containing 43.8 g of glucose (C6H12O6) dissolved in 359.9 g of water. Calculate the freezing point depression for the same solution.
boiling point elevation = _____ degrees Celsiusfreezing point depression = ____ degrees Celsius
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04/29/20

Calculate the molarity of 5.3 moles of MgCl2 in 0.7 L of solution. Report your answer with 3 decimal places.
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04/29/20

How many moles of NaCl are in 4,656 mL of a 4.38 M solution? Report your answer with 3 decimal places.
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04/29/20

When 0.73 g of an unknown non-electrolyte is dissolved in 50.0 g of benzene, the freezing point decreased to 5.22 degrees C from 5.5 degrees C.

If the Kfp of the solvent is 5.12 K/m, calculate the molar mass of the unknown solute.
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04/29/20

At 25 ºC the mixture will have a pH of
100.0 mL of a 0.50 M aqueous NH3 solution is mixed with 200.0 mL of 0.25 M aqueous HI. At 25 ºC the mixture will have a pH ofThe correct answer is <7
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04/29/20

What is the value of E for a cell in which [Cu2+] = 1.0 x 10-3 M and [Zn2+] = 1.0 M?
The value of Eºcell for the reaction Zn(s) + Cu2+(aq) <=> Zn2+(aq) + Cu(s) is 1.10 V. What is the value of E for a cell in which [Cu2+] = 1.0 x 10-3 M and [Zn2+] = 1.0 M?The correct answer is... more
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04/29/20

Sodium phosphate, (Na3PO4) combines with calcium chloride to yield calcium phosphate and sodium chloride. If 2.4 grams of sodium phosphate is used, how many grams of chloride is produced?

What type of reaction is represented?
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04/29/20

which of the following is an isomer of ch3-ch2-cooh?

CH3 - C - OH - CH3 CH3 - CO - O - CH3 CH3 - CO - CO - CH3 CH3 - CH2 - CO2 - CH3
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04/29/20

what is Kc for the reaction?
When 0.60 mol NH3 is decomposed in a 1 Liter flask at 850 K, the equilibrium concentration of NH3 is measured as 0.12 M. Given that ammonia decomposes according to the reaction 2 NH3(g) <=>... more
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04/29/20

What is the percent of molecules?
A container holds two gases, A and B. Gas A has a partial pressure of 325 torr and gas B has a partial pressure of 488 torr. What percent of the molecules in the mixture is gas A?
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04/29/20

Find the unknown metal
A certain metal (M) reacts with HCl according to the equation; M (s) + HCl (aq) → MCl2 (aq) + H2 (g) 1.44 g of the metal reacts with 225 mL of 0.196 mol/L HCl. What is the metal?
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04/29/20

Calculate the energy required to heat a beaker of water at 33 °C to boiling (Boiling is 100°C). The mass of the water is 54.1 g and it has a specific heat of 4.18 J/g*°C.
Calculate the energy required to heat a beaker of water at 33 C to boiling
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04/29/20

What is the molality of an aqueous solution containing FeCl3 (MM = 162.2 g/mol) with a mole fraction of FeCl3 of 0.15?
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04/28/20

Stressed applied

Which direction will the reaction CO2 (g) + H2 (g) + heat > CO (g) + H2O (g) shift when these occurCO addedCatalyst addedtemperature increased pressure increase
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