447 Answered Questions for the topic chem

Chem Chemistry

29d

A mole of doughnuts would cover the entire earth to a depth of 8 km.

Can you please show me how to calculate something like this.
Chem Chemistry

04/05/22

Chemistry question pls help

A 0.623 g sample of a metal, M, reacts completely with sulfuric acid according to M(s)+H2SO4(aq)⟶MSO4(aq)+H2(g) A volume of 283 mL of hydrogen is collected over water; the water level in the... more

Identify the nucleophilic centers in the following molecules:

1) 2) 3)
Chem Chemistry

03/28/22

what is the pH of a solution made by mixing 60cm3 1.0M NaCH3COO(aq) with 40cm3 0.50 M HCl (aq)?

what is the pH of a solution made by mixing 60cm^3 1.0M NaCH3COO(aq) with 40cm^3 0.50 M HCl (aq)?Ka of CH3COOH is 1.8 x 10^-5.

03/28/22

On a 5 day wilderness expedition you'll need to heat 4.0 kg of water to the boiling point each day. The air temperature will average 25°C.

You have available canisters of compressed butane C4H10 fuel, which you'll burn to heat the water. Each canister has 100.g of butane in it. What is the minimum number of fuel canisters you must... more

A 7.00 L tank at 7.66 degrees C is filled with 4.90 g of dinitrogen monoxide gas and 4.66 g of chlorine pentafluoride gas. You can assume both gases behave as ideal gases under these conditions.

Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Round each of your answers to 3 significant digits.= _____

02/18/22

Use the plotting and linear regression tools in Excel to calculate K and β from the data in the table.

For the question below I am having difficulty getting the right answer and I don't know if I am wrong or if my homework software is marking it wrong when it is right. I added my answers at the... more

A chemist prepares a solution of silver(II) oxide (AgO) by measuring out 0.00339 μmol of silver(II) oxide into a 450. mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mmol/L of the chemist's silver(II) oxide solution. Round your answer to 3 significant digits.= ____ mmol / L

I need help in my Chemistry...

What is the procedure and solution in performing these? How many mL of 0.310 M barium nitrate are required to precipitate as barium sulfate all the sulfate ions from 28.0 mL of 0.380 M aluminum... more

A chemist prepares a solution of copper(II) sulfate by measuring out 45.0 μmol of copper(II) sulfate into a .450 ml volumetric flask and filling the flask to the mark with water.

Calculate the concentration in μmol / L of the chemist's copper(II) sulfate solution. Round your answer to 3 significant digits.= ____ μmol / L

02/09/22

Aqueous hydrobromic acid (HBr) reacts with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H2O).

If 2.56g of sodium bromide is produced from the reaction of 6.5g of hydrobromic acid and 5.7g of sodium hydroxide, calculate the percent yield of sodium bromide. Round your answer to 2 significant... more
Chem Chemistry

02/08/22

Chemistry equilibrium

20.00 mL of a 0.25 M solution of BaCl2(aq) was added to an equal volume of 0.35 M solution of Na2SO4 (aq). Show a precipitate forms then calculate the concentration of free Ba^ 2+ (aq) when the... more

Gaseous butane (CH3(CH2)2 CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O).

If 18.5g of water is produced from the reaction of 34.3g of butane and 87.1g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.= _____ %

Aqueous hydrobromic acid (HBr) reacts with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H2O).

What is the theoretical yield of sodium bromide formed from the reaction of 4.0g of hydrobromic acid and 3.4g of sodium hydroxide? Round your answer to 2 significant figures.

02/02/22

Gaseous butane (CH3(CH2)2 (CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O)

What is the theoretical yield of water formed from the reaction of 4.65g of butane and 26.5g of oxygen gas? Round your answer to 3 significant figures.= _____ g

01/30/22

CHEMISTRY ANSWER!!!!

The distance from the sun to the earth is 1.50 x 10^8 km. The speed of light is 3.00 x10 ^8m/s. How many round trips between Earth and the sun could a beam of light make in one day?

01/29/22

Chemistry moles, molecules, ions, and molarity question

A solution containing 50.8 g of sodium sulfate in a volume of 0.558 L was prepared. Calculate the number of moles of sodium sulfate in this solution. Calculate the number of molecules of sodium... more

01/27/22

Acetylene (C2H2) is used in welding torches because it has a high heat of combustion. When 1.00 g of acetylene burns completely in excess O2 gas at constant volume, it releases 48.2 kJ of energy.

Calculate the molar heat of combustion of acetylene (kJ/mol) and the energy kJ) released per mole of O2 consumed

Consider the following electrolytic cell, C(s) ⎜CrBr3(aq),⎟ C(s) 

Determine the standard cell potential Include the half reactions, indicating the cathode and the anode Include the overall reaction

Consider the following electrolytic cell, C(s)|NiI2(aq),|C(s)

a. Identify potential Oxidizing agents and Reduction agentsb. Determine the standard cell potentialc. Include the half reactions, indicating the cathode and the anoded. Include the overall reaction

help me pls w this chemistry question

A gas occupies 24 L at 273 K and 1.0 atm. What is the volume if the conditions change to 388 K and 3.0 atm?

Calculate the concentration of sodium formate and formic acid when the buffer is at pH = 3.9.

You are preparing 1L of a 250mm formic acid buffer. The pka of formic acid is 3.75. Calculate the concentration of sodium formate and formic acid (each in mM) when the buffer is at pH = 3.9. At pH... more
Chem Chemistry

12/17/21

Chem help plz!!!

Iron (II) can be precipitated from neutral solutions by oxidizing it with MnO4–:MnO−4​(aq)+3Fe(OH)+(aq)+2OH−(aq)+2H2​O(l)MnO2​(s)+3Fe(OH)3​(s) What volume of 0.825 M MnO4– is needed to completely... more

Do the molecular orbitals that are occupied by electrons have MORE or LESS nodes than the unoccupied orbitals, and are they at a HIGHER or LOWER energy level?

A) A molecule with eight carbons and alternating single and double bonds (C=C-C=C-C=C-C=C) has eight delocalized electrons in large molecular orbitals that span the length of the molecule. Eight... more

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