09/20/20

At −11.0 ∘C , a common temperature for household freezers, what is the maximum mass of sucralose (C12H19Cl3O8) you can add to 1.50 kg of pure water and still have the solution freeze?

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09/20/20

Shouldn't there be 2 significant figures?
If you start out with 12 oz, why does your final answer have 3 sig figs?
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09/20/20

How do I solve this, I’m lost !
The molar absorptivity constant for ß–Carotene at its analytical wavelength is 139, 500M¯1cm¯1. Use beers law to protect absorbance of dilution D. dilution D : 5.00 of dilution C(original volume),... more
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09/20/20

Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.
Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.Ammonium Chloride (ΔHsol = +14.7 kJ/mol)
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09/20/20

Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC.
Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC. Assume that the initial temperature of... more
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09/20/20

When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?
When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?a. Doubling the amount of... more
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09/20/20

I need help with this problem

If a person consumes one class (240 mL) of the sample Drink every day for one year, how many moles of the drink mix would they consume?
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09/20/20

I need help solving this

What volume of 500.0 mM drink mix would be needed to prepare 100.0 mL of a solution with an absorbance of 0.400
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC. What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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09/20/20

What is the amount of ammonia (17.03 g/mol) that can be obtained by complete reaction of 35 g of nitrogen gas (28.01 g/mol) with excess hydrogen gas
What is the amount of ammonia (17.03 g/mol) that can be obtained by complete reaction of 35 g of nitrogen gas (28.01 g/mol) with excess hydrogen gasaccording to the balanced equation:N2 + 3H2 = 2NH3
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09/20/20

What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
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09/20/20

What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
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09/20/20

What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
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09/20/20

I need help with this problem !
A 25.0mL solution of HCL is neutralized with 12.7 mL of 0.240M Ba(OH)2. What is the concentration of the original HCl solution
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09/20/20

I need help solving this !
What is the mass percent of water in Zn(NO3)2•6H2O
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09/20/20

I need help solving this

What volume (in mL) of 0.2600M HBr is required to neutralize 40.00mL of 0.8000 M NaOH?
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09/20/20

Calculate the final concentration, M
Calculate the final concentration(M) of each dilution:dilution A: 5.00 mL stock solution (1.00mM)dilution B: 5.00 mL of dilution Adilution C: 5.00 mL of dilution Bdilution D: 5.00 of dilution... more
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09/19/20

How do I solve this, please be detailed
If 25.0g of NH3 and 45.0 g of O2 react in the following reaction, what is the mass in grams of NO that will be formed?4NH3(g) + 5O2 (g) = 4NO (g) + 6H2O(g)
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09/19/20

How many grams of carbon dioxide are needed to produce 125 grams of urea?
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09/19/20

I need help solving this problem!! Please be detailed

If 50.0g of H2 and 100.0g of O2 react, how many moles of H2O can be produced in the reaction below? 2H2(g) + O2(g)= 2H2O(g)
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09/19/20

How do I balance this

Write a balanced chemical equation based on the following description: butanoic acid, C3H7COOH(l) burns in air
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09/19/20

Molecular calculation / empirical formular
Aspirin has the chemical formula C9H8O4. 1) How many grams of O are present in 1.25 moles of Aspirin?1.25 = 15.999/1 = 19.999 = 20 gO2) How many atoms of H are present in 1.25 moles of Aspirin?... more
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09/18/20

The specific heat of a certain type of metal is 0.128 .0.128 J / (gcC) . What is the final temperature if 305 of heat is added to 68.5 g68.5 g of this metal , initially at 20.0 ?
The specific heat of a certain type of metal is 0.128 .0.128 J / (gcC) . What is the final temperature if 305 of heat is added to 68.5 g68.5 g of this metal , initially at 20.0 ?
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09/18/20

Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid fuel rocket motors.

The reaction isFe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s)What mass of iron(III) oxide must be used to produce 76.73 g of iron? (Answer in grams)What mass of aluminum must be used to produce 76.72 g of... more
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09/18/20

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s) →2K2O(s) + 2N2(g) + 5O2(g)
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s) →2K2O(s) + 2N2(g) + 5O2(g)To produce 92.0 kg of O2, how many (a) moles of KNO3 must be... more
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