10/07/21

Find the molecular formula for a compound with an emperical formula C2H2N and a molar mass of 46g/mol
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10/07/21

electrical structure and chemical bonding
Write the electron configuration for a neon cation with a charge of +2. 
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10/07/21

Confused about this problem
When (1.000x10^1) grams of calcium carbonate (CaCO3) is reacted completely with 50.0 mL of hydrochloric acid (HCl, d = 1.096 g/mL), all of calcium carbonate reacts to form a solution that weighs... more
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10/07/21

solvin for a reactant using a chemical equation

Ammonium phosphate NH43PO4 is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid H3PO4 with ammonia NH3.What mass of ammonium phosphate is produced by the... more
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10/07/21

the equilibrium expression of base dissociation of triethylamine
Triethylamine (C6H15N) is an organic base which is useful in pesticide production and organic synthesis. It has a pKa of 10.75 and density of 726 kgm-3 . It will partially dissociate in water... more
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10/07/21

please determine the pressure of butane gas (C4H10) in the gas box at 30oC.

Consider a gas cylinder with volume of 31200dm3 for storing and shipping pure butane gas (C4H10), it is known that the pressure in the bottle is 41kPa at 15oC. (c) In order to reduce the pressure... more
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10/07/21

Please find the number (in integers) of pills used for preparing the 250mL solution.
Aspirin is a common drug for curing inflammation and fever. The active ingredient of aspirin is known as acetylsalicylic acid (C9H8O4). It is a monoprotic acid and protonates according to the... more
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10/07/21

volume of 0.0924 M NaOH

What volume of 0.0924 M NaOH would be required to exactly neutralize 6.25 mL of a vinegar solution which is 3.54% acetic acid by mass? The density of vinegar is 1.005 g/mL. Show all calculations.
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10/07/21

calculate molar enthalpy
Using the equations 2 H₂ (g) + O₂ (g) → 2 H₂O (l) ∆H° = -572 kJ/mol Ca (s) + ½ O₂ (g) → CaO (s) ∆H° = -635 kJ/mol CaO (s) + H₂O (l) → Ca(OH)₂ (s) ∆H° = -64 kJ/mol Determine the molar enthalpy (in... more
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10/07/21

measuring gas pressure

1.     Measuring Gas Pressure with a Manometer. Oyster shells are composed of calcium carbonate (CaCO3). When the shells are roasted, they produce solid calcium oxide (CaO) and CO2. A... more
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10/06/21

What is the net charge of the tripeptide at pH 11.5?
Consider the following pKa values for glycine, arginine, and lysine. What is the approximate net charge of the tripeptide Gly-Arg-Lys at pH 11.5?Free amino acid pKa of alpha-carboxyl group ... more
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10/06/21

What atom/ion is being oxidized?
S2O32- (aq) + 2 Br2 (l) + 5 H2O (l)  →→  2 SO42- (aq) + 4 Br - (aq) + 10 H+ (aq)
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10/06/21

Can someone please check-over my answers to these Chemistry questions?
*My answers are boxed.*The symbol _______ stands for a change is entropy.A. ΔEB. ΔGC. ΔHD. ΔSE. ΔTThe symbol _______ stands for a change is enthalpy.A. ΔEB. ΔGC. ΔHD. ΔSE. ΔTThe symbol _______... more
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10/06/21

Can someone please help me with this Chemistry problem?

For the equation CH4 + 2O2 → CO2 + H2O + 803.1 kJ, how much heat will be released if 2.0 × 101 g of CH4 react with sufficient O2? A. 883 kJB. 883 kJ/molC. 1.0 × 103 kJD. 1.0 × 103 kJ/molE. None of... more
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10/06/21

Write the net ionic equation for the reaction of iron metal with aqueous silver nitrate. Include physical states.
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10/06/21

For the chemical reaction HCN(aq)+KOH(aq)⟶H2O(l)+KCN(aq) write the net ionic equation, including the phases.
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10/06/21

What is the partial pressure of SO2Cl2 in this mixture?

Consider the reaction: SO2Cl2(g)⇌SO2(g)+Cl2(g), Kp=2.91×103 at 298 K In a reaction at equilibrium, the partial pressure of SO2 is 0.145 torr and that of Cl2 is 0.337 torr .
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10/06/21

What is the partial pressure of NOBr in this mixture?

Consider the reaction                   2NO(g)+Br2(g)⇌2NOBr(g)              ,Kp=28.4 at 298 K  In a reaction mixture at equilibrium, the partial pressure of NO is 104 torr and that of Br2 is 135... more
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10/06/21

How many liters (L) of a 0.1154 M aqueous HCl solution is required to reach the first equivalence point of 0.1136 moles of Na2CO3?

How many liters (L) of a 0.1154 M aqueous HCl solution is required to reach the first equivalence point of 0.1136 moles of Na2CO3?
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10/06/21

fter completing an experiment, a student extracts a sample of calcium carbonate with a mass of 0.88 grams from an antacid tablet that claims to have 1000 mg of calcium carbonate.

After completing an experiment, a student extracts a sample of calcium carbonate with a mass of 0.88 grams from an antacid tablet that claims to have 1000 mg of calcium carbonate. What is the... more
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10/05/21

An experiment requires 12.0 mL of a 0.100 M solution of HCl. If you have a 12.0 M HCl stock solution in the laboratory, how would you prepare enough 0.1 M solution to run at least 3 experiments?
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10/05/21

Henry's law with CO2
You have a sealed 2 liter flask that contains nothing but water and carbon dioxide. The flask is half-filled with liquid water, has a temperature of 25°C, and the overall pressure within the flask... more
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10/05/21

Need help on this!!
How many moles of HCl(aq) are present in 13.87mL of 4.96M HCl(aq)? (Report your answer to 4 decimal places.)
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10/05/21

Chem Net ionnic equation
Write the net ionic equation, including phases, that corresponds to the reactionZn(ClO4)2(aq)+K2CO3(aq)⟶ZnCO3(s)+2KClO4(aq)
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10/05/21

What is the pH of the mixture?
Room temperature sample of water with a volume of 230.1 mL is placed into a flask. A volume of 2.3 mL of 0.0351 M NaOH is then added to the water in the flask. 
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