04/01/20

How much energy is released when 32.0 g of molten lead solidifies?

The chart shows enthalpy fusion kJ/kg for lead is 24.5 and enthalpy of vaporization for lead is 871
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04/01/20

the molecular weight of the unknown gas?
A 3.00 gram sample of an unknown gas is found to occupy a volume of 2.43 L at a pressure of 792 mm Hg and a temperature of 58 °C. The molecular weight of the unknown gas is ____ g/mol.Assume ideal... more
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04/01/20

how many grams of Ne gas are needed?
It is desired to inflate a baggie with a volume of 803 milliliters by filling it with neon gas at a pressure of 0.739 atm and a temperature of 298 K. How many grams of Ne gas are needed?  ____ g
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04/01/20

the temperature of the gas sample

A sample of nitrogen gas occupies a volume of 8.42 L at 44°C and 847 mm Hg. The volume of the gas sample increases to 10.2 L while its pressure decreases to 562 mm Hg. If the ideal gas law is... more
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04/01/20

consider the following
Consider the following gas phase reaction:C2H6(g) + Cl2(g)C2H5Cl(g) + HCl(g)If 2.07 liters of C2H6(g) gas at 116°C and 0.911 atm is used, what volume of Cl2(g) gas at the same temperature and... more
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04/01/20

Ammonia - Ammonium Chloride Buffer Systems
Can the NH3/NH4Cl system be used to prepare a buffer of a pH 9.5? Why or why not? Yes, but I am not sure why.Can the NH3/NH4Cl system be used to prepare a buffer of a pH 5.0? Why or why not? No but... more
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04/01/20

Compare the buffer capacity of 1 liter of regular buffer E to 1 liter of diluted buffer E in its ability to neutralize the addition of HNO3. Why is this so?
I am confused on why the buffer capacity of a diluted buffer is less than that of a regular buffer. The buffer capacity of 1-L buffer in solution of 0.2 M HNO3 is .0419 and for a diluted buffer the... more
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04/01/20

gram/mol, gram/liter
A 3.68 gram sample of an unknown gas is found to occupy a volume of 1.53 L at a pressure of 805 mm Hg and a temperature of 44°C. The molecular weight of the unknown gas is  _____g/mol.A sample... more
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04/01/20

a sample of oxygen, helium-filled ballon?
A sample of oxygen gas occupies a volume of 7.02 L at 52.0°C and 0.650 atm.If it is desired to decrease the volume of the gas sample to 4.59 L, while increasing its pressure to 0.800 atm, the... more
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04/01/20

what is the density in G/L, what is the molecular weight?
A 4.64×10-2 mol sample of Ar gas is contained in a 2.00 L flask at room temperature and pressure. What is the density of the gas, in grams/liter, under these conditions?A 0.255 mol sample of an... more
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03/31/20

gas laws problems
a sample of hydrogen has a volume of 60.0 L a a pressure of 730 mmHg what will the volume be a 760 mmHg? a sample of chlorine has a volume of 654 mL at a prressure of 810 mmHg. what will the... more
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03/31/20

How do you calculate the volume?
Determine the volume in mL of 0.53 M HClO4(aq) needed to reach the half-equivalence (stoichiometric) point in the titration of 41.3 mL of 0.55 M CH3CH2NH2(aq).
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03/31/20

How many moles of MnCl2 can be produced when 25 g KMnO4 are mixed with 85 g HCl
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03/31/20

How many grams of H2O are produced when 30.0 grams of C3H8 are combusted?
How many grams of H2O are produced when 30.0 grams of C3H8 are combusted?
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03/31/20

is Q greater, equal, or less than Ksp
The Ksp of AgCl at 25 oC is 1.6 x 10-10. Consider a solution that is 1.0 x 10-2 M in CaCl2 and 1.0 x 10-8 M in AgNO3.
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03/31/20

Finding the Excited State?
A hydrogen atom in an excited state returns to the ground state. The photon emitted in this process has a wavelength of 122 nm. What was the excited state of the hydrogen atom prior to returning to... more
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03/31/20

Chemistry question about ionic compound
In chemistry, any ionic compound (soluble or insoluble) that is formed from a reaction between an acid and a base is called a(n) _________. ionic compound substance salt product neutralization
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03/31/20

Calculate the solubility of Fe(OH)3 in each of the following:
Calculate the solubility of Fe(OH)3 in each of the following:ksp = 4 x 10-38a. Water b. A solution buffered at pH = 5.0c. A solution buffered at pH = 11.0when I calculate this I get (a) equals 1.96... more
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03/31/20

Calculate the molar solubility of Al(OH)3
Calculate the molar solubility of Al(OH)3. The Ksp = 2.0 x 10-32I can’t seem to find the right answer no matter how I try it. When I work this out I get:Al(OH)3 —> Al + 3 OHKsp = [Al] [OH]3[Al]... more
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03/31/20

assume ideal behavior
1.A sample of oxygen gas has a density of  g/L at a pressure of 1.11 atm and a temperature of 38°C. Assume ideal behavior.2.A sample of an unknown gas is found to have a density of 2.41 g/L at a... more
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03/31/20

molecular weight is?
1.A 2.41 gram sample of an unknown gas is found to occupy a volume of 1.53 L at a pressure of 452 mm Hg and a temperature of 39°C. The molecular weight of the unknown gas is  g/mol.2.A 3.68 gram... more
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03/31/20

An aqueous solution contains 0.466 M ammonia (NH3).  
An aqueous solution contains 0.466 M ammonia (NH3).  How many mL of 0.278 M hydrochloric acid would have to be added to 225 mL of this solution in order to prepare a buffer with a pH of 9.180. 
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03/31/20

A buffer solution contains 0.492 M acetic acid and 0.241 M potassium acetate.  
A buffer solution contains 0.492 M acetic acid and 0.241 M potassium acetate.  If 0.0302 moles of sodium hydroxide are added to 225 mL of this buffer, what is the pH of the resulting... more
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03/31/20

A buffer solution contains 0.492 M acetic acid and 0.241 M potassium acetate.  
A buffer solution contains 0.492 M acetic acid and 0.241 M potassium acetate.  If 0.0302 moles of sodium hydroxide are added to 225 mL of this buffer, what is the pH of the resulting... more
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03/31/20

Calculate the pH at the halfway point and at the equivalence point for each of the following:
Calculate the pH at the halfway point and at the equivalence point for each of the following:b) 100 mL of 0.10 C2H5NH2 (Kb - 5.6 x 10-4) titrated by 0.20 M HNO3I am lost with this process so please... more
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