450 Answered Questions for the topic chem

11/18/19

What volume (in mL) of 4.46 M HCl is required to fully react with 19.3 mL of 2.13 M Ca(OH)2?
Consider the following balanced equation.2HCl (aq) + Ca(OH)2 (aq)  2H2O (l) + CaCl2 (aq)
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11/18/19

Calculate the amount of heat absorbed (in kJ) when 35.15 g of CO2 reacts.
2Fe3O4 (s) + CO2 (g)  3Fe2O3 (s) + CO (g)     H = 47.2 kJ
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11/18/19

If 1.49 grams of NO react, how many grams of NO2 form?
Consider the following balanced reaction.2H+ (aq) + 2NO3- (aq) + NO (g)  3NO2 (g) + H2O (l)
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11/16/19

Consider the following balanced chemical equation: 2K3PO4 (aq) + 3MgBr2 (aq) ----> Mg3(PO4)2 (s) + 6KBr (aq)

A 97.17 mL sample of 1.4 M K3PO4 is mixed with 45.24 mL of 0.615 M MgBr2. After reaction, what is the concentration of the excess reactant (in M)?
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11/16/19

Consider the following balanced chemical equation: 4Na (s) + O2 (g) ----> 2Na2O (s) . Calculate the volume of O2 gas (in L) needed at STP to react with 89 g Na.
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11/15/19

A chemist prepares a solution of iron chloride by measuring out 0.10 g of FeCl2 into a 50. mL volumetric flask and filling to the mark with distilled water.

Calculate the molarity of anions in the chemist's solution.
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11/14/19

Fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. What volume of hydrogen fluoride would be produced by this reaction if 4.8 cm^3 of fluorine were consumed?

Answer has a unit symbol, and is rounded to the correct number of significant digits.
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11/14/19

Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. What volume of water would be produced by this reaction if 7.7 cm^3 of hydrogen chloride were consumed?
Answer has a unit symbol, and is rounded to the correct number of significant digits.
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11/13/19

Suppose 22. g of octane is mixed with 98.0 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction.
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11/12/19

Balance the molecular equation below and write the balanced complete and net ionic equations for the following unbalanced molecular reaction.
_SrBr2(aq) + _K2SO4(aq) ------> _SrSO4(s) + _KBr(aq)
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Chem Chemistry

11/11/19

Using the provided table, determine the enthalpy for the reaction 2 NH₃ (g) + 3 N₂O (g)→ 4 N₂ (g) + 3 H₂O (l)
Substance ∆Hf° (kJ/mol)NH3 (g) -46.2N2O (g) 81.6N2 (g) 0H2O (l) -285.8
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11/06/19

A student has prepared a 150.0 mL of 2.25 M Na3PO4. What is the chemical equation for the dissolving of Na3PO4 in water?
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11/05/19

A student has prepared 150.0 mL of 2.25 M Na3PO4. How many moles of ions are present in the solution?
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11/05/19

The container tells us that con H2SO4 (aq) is 96.0% by mass H2SO4 and has a density of 1.84 g/mL. In carrying out the calculation, assume you are starting with 1.00 L of con H2SO4 (aq).
a) What is the mass of 1.00 L of con H2SO4 (aq)?b) How many grams of H2SO4 are in this 1.00 L of solution? How many moles of H2SO4 is this? c) Calculate the morality of this con H2SO4 solution.d)... more
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11/05/19

How many grams of Green #3 dye (808.84 g/mol) are needed to prepare 5.00 L of a 3.08 x 10^-5 M solution?
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11/05/19

Calculate the concentration of the dye Blue #1 if 0.610 g are used to prepare 5.0 L of solution. The molar mass of Blue #1 is 792.86 g/mol.

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11/05/19

In two steps, calculate the concentration of a dilute solution made by diluting 6.50 mL of a 7.30 x 10^-5 M stock solution of yellow dye #6 to a volume of 25.00 mL.

a) Calculate the number of moles of yellow dye #6 in 6.50 mL of the stock solution.b) Calculate the concentration of the diluted solution.
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11/03/19

Calculate the concentration (in M) of ammonium ions when 10.3 mL of 0.803 M ammonium carbonate and 12.7 mL of 0.984 M ammonium chloride are combined.
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11/03/19

Calculate the concentration (in M) of NO3- in a solution prepared by dissolving 84.2 g Al(NO3)3 in water to prepare 456 mL of solution.
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11/03/19

A 36.9 mL sample of solution contains 10.5 g MgBr2. If the solution is 17.7% MgBr2 by mass, what is the density of the solution (in g/mL)?
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10/31/19

Double Displacement Reaction Calculations
In our lab we completed conductometric titrations of FeCl3·6H2O + NaOH and CuCl2·2H2O + NaOH.My question that has two parts:1- If you could manipulate individual molecules and knew that you had 36... more
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10/30/19

Reacting one mole of sodium bicarbonate produces one mole of CO2 (g). Therefore, the mole ratio is 1mol sodium bicarbonate: 1 mol CO2. How many moles of CO2 are produced from one Alka-Seltzer tablet?
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10/30/19

How many moles of CO2 are produced from one Alka-Seltzer tablet?
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10/30/19

Assuming 1 atm of pressure and room temperature (293.15 K), how many mL of CO2 are produced from one tablet?
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10/30/19

How many moles of sodium bicarbonate are found from one Alka-Seltzer tablet?
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