J.R. S.

04/28/20

How much sodium hydroxide must you start with to yield 145 g of aluminum hydroxide

given the equation: Al2(SO3)3+ 6NaOH ----> 3Na2SO3 + 2Al (OH)3 and you start with 389.4 g of Al2(SO3)3 and isolate 212.4 g of Na2SO3 How much sodium hydroxide must you start with to yield 145 g... more

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Chemistry

04/28/20

Calculate ΔGº for this reaction at 25 °C

The value of Eºcell for Cr|Cr3+||Hg22+|Hg(l) is 1.78 V. Calculate ΔGº for this reaction at 25 °CThe correct answer is -1031 kJ

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Chemistry

04/28/20

what is the partial pressure of CO2(g) at equilibrium if initially 4.00 atm of CO(g) is in contact with graphite?

Given that Kp = 1.5 x 10-4 for the reaction 2 CO(g) <=> C(graphite) + CO2(g), what is the partial pressure of CO2(g) at equilibrium if initially 4.00 atm of CO(g) is in contact with... more

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Chemistry Biochemistry Organic Chemistry

04/28/20

The standard enthalpy change for the following reaction is -1.39×103 kJ at 298 K.

The standard enthalpy change for the following reaction is -1.39×103 kJ at 298 K. 3 Mn(s) + 2 O2(g)Mn3O4(s) ΔH° = -1.39×103 kJ What is the standard enthalpy change for the reaction Mn3O4(s)3... more

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Science Chemistry

04/28/20

how many grams of 206Hg will you have after 17.5 years?

210Pb has a half-life of 22.3 years and decays to produce 206Hg. If you start with 7.50 g of 210Pb, how many grams of 206Hg will you have after 17.5 years?The correct answer is 3.09But I keep... more

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Chemistry

04/28/20

If 3.86 mol of an ideal gas has a pressure of 2.10 atm and a volume of 77.27 L, what is the temperature of the sample in degrees Celsius?

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Chemistry

04/28/20

If 0.10 moles of argon gas exert a pressure of 0.84 atm at 25°C what volume does it occupy in L?

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Chemistry

04/28/20

Solid zinc (Zn) reacts with hydrogen chloride to produce zinc(II) chloride and hydrogen gas. If 5.69g of hydrogen gas is released, how many grams of hydrogen was used?

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Chemistry Asap Hess's Law

04/28/20

Help! Please! Heat Capacity of Calorimeter & Hess's Law

You used a bomb calorimeter, or constant-volume calorimeter, but misplaced the information of heat capacity of the calorimeter. If you burn 1.250 g of an organic compound, with, ΔE = -24.30kJ/g,... more

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Chemistry

04/28/20

Propane (C3H8) reacts with excess oxygen gas to produce carbon dioxide and water. If you start with 19.3 g of propane, how many grams of carbon dioxide is produced?

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Math Chemistry

04/28/20

PLZ HELP WITH MATH QUESTION

Katherine and Elijah are making customized jewelry for their clients. They use metal alloys with copper to design their products. Currently, they have an alloy that is 20% copper and an... more

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Chemistry

04/27/20

How many grams of cobalt may be formed by the passage of 3.57 amps for 1.44 hours through an electrolytic cell that contains an aqueous cobaltic (Co(III)) salt.

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Chemistry

04/27/20

How many coulombs are required to produce 29.9 g of aluminum metal from a sample of molten aluminum fluoride?

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Chemistry

04/27/20

What is the total work (in joules) in going from the initial to the final state by way of the preceding two steps?

One mole of an ideal gas is contained in a cylinder with a movable piston. The temperature is constant at 72°C. Weights are removed suddenly from the piston to give the following sequence of three... more

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Chemistry Biochemistry Organic Chemistry

04/27/20

Gases Liquids and Solids 4.27.20

A solution of ethanol CH3CH2OH and water that is 10.% ethanol by mass is boiling at 98.7°C. The vapor is collected and cooled until it condenses to form a new solution.Calculate the percent by mass... more

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Chemistry

04/27/20

Write a shorthand cell diagram, and calculate the standard cell potential (E°

The following half-reactions are joined to form a galvanic cell that generates a current under standard conditions. Identify what is oxidized and what is reduced. Write a shorthand cell diagram,... more

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Chemistry

04/27/20

Predict the standard potential (E°) of the galvanic cells

Predict the standard potential (E°) of the galvanic cells with the following cell reactions: a) 3 V2+(aq) + 2 U°(s) → 2 U3+(aq) + 3 V° b) Sn2+(aq) + Pb4+(aq) → Sn4+(aq) + Pb2+(aq)

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Chemistry

04/27/20

How many grams of chromium metal are plated out

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr+3 ions for 320 minutes?(at .wt. Cr = 52 g/mol)

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Chemistry

04/27/20