07/23/20

Chem HW Problem

A 2.50 L flask initially contains 5.0 g of methane and 10.0 g of oxygen. How many grams of each species (including water) will be present when the reaction reaches equilibrium at 25°C.CH4(g) +... more
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07/23/20

C2H4(g) + H2(g)C2H6(g)
A sample of gas contains 0.1100 mol of C2H4(g) and 0.1100 mol of H2(g) and occupies a volume of 10.1 L. The following reaction takes place:C2H4(g) + H2(g)C2H6(g)Calculate the volume of the sample... more
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07/23/20

A sample of gas contains 0.1100 mol of C2H4(g) and 0.1100 mol of H2(g) and occupies a volume of 10.1 L.
The following reaction takes place: C2H4(g) + H2(g)C2H6(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
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07/23/20

the volume of the gas sample will be L?
A sample of krypton gas at a pressure of 982 mm Hg and a temperature of 30 °C, occupies a volume of 7.68 liters. If the gas is cooled at constant pressure to a temperature of 7 °C, the volume of... more
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07/22/20

If 52 grams of C2H4 is burned in the presence of 144 grams of oxygen, what is the % yield of the reaction if 90 grams of carbon dioxide is produced in the reaction?
For the following reaction:C2H4 + 3O2 —> 2H2O + 2CO2If 52 grams of C2H4 is burned in the presence of 144 grams of oxygen, what is the % yield of the reaction if 90 grams of carbon dioxide is... more
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07/22/20

A commercial refrigeration unit accidentally releases (7.39*10^1) mL of ammonia gas at SATP. Determine the mass and number of molecules of ammonia gas released.
Please show all the work, because I am getting 2 different answers.Note: Your answer is assumed to be reduced to the highest power possible.
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07/22/20

Calculate the heat energy released when 14.0 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
constants for mercury at 1 atm:heat capacity of Hg(l) is 28.0 J/mol*Kmelting point is 234.32 Kenthalpy of fusion is 2.29 kJ/mol
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07/22/20

A certain substance has a heat of vaporization of 65.34 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.00 times higher than it was at 299K?
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07/22/20

A scientist isolated 3.621g of a gas. The sample occupies a volume of 975.8mL at 74.4 degrees Celsius and 97.0 kpa. Calculate the molar mass of the gas.show all work
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07/21/20

In the laboratory you dilute 5.09 mL of a concentrated 12.0 M perchloric acid solution to a total volume of 150 mL. What is the concentration of the dilute solution?
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07/21/20

If we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00 yr. This means that the half-life of strontium-90 is ________ yr.
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07/20/20

what is the ligand for trypsin
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07/20/20

If 128 grams of calcium carbide, CaC2, is combined with 108 g of water, is there a limiting reagent? If so which reagent is the limiting reagent?
Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2):CaC2 (s) + 2H2O (g) produces Ca (OH)2 (s) +C2H2 (g)If 128 grams of calcium carbide, CaC2, is combined with 108 g of water, is... more
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07/20/20

In the laboratory, a student dilutes 26.8 mL of a 7.23 M hydrobromic acid solution to a total volume of 150.0 mL. What is the concentration of the diluted solution?
Concentration = ?  M
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07/20/20

4. NEED HELP FAST

For the oxidation–reduction reaction equation2Na+S⟶Na2S indicate how many electrons are transferred in the formation of one formula unit of product.electrons:
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07/20/20

15. NEED HELP FAST

Given the informationA+B⟶2D Δ𝐻∘ =-677.5kJ Δ𝑆∘= 370.0 J/K C⟶D Δ𝐻∘ = 509.0kJ Δ𝑆∘=-243.0 J/K calculate  Δ𝐺∘  at 298 K for the reactionA+B⟶2C Δ𝐺∘=
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07/20/20

What is the original concentration of  Li^+ in the serum?
The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed using flame emission spectroscopy. A sample of the serum gave a reading... more
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07/19/20

How many moles of  NaOH  are present in 26.5 mL  of  0.100M NaOH?

How many moles of NaOH are present in 26.5 mL of 0.100M NaOH?moles:
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07/19/20

Chemistry and TEAS 101
What is the mass of the precipitate formed when 50ml of 12% solution of AgNO3 is mixed with 50 ml of 6.7% solution of NaCl?
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07/18/20

What volume of 0.812M HCl is required to titrate 1.33g of NaOH to the endpoint?
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07/18/20

How many moles of ammonium ions are in 10.0g of ammonium phosphate

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07/18/20

How many molecules(not moles) of NH3 are produced from 8.69x10 ^-4g of H2? Express your answer numerically as the number of molecules.
How many molecules(not moles) of NH3 are produced from 8.69x10 ^-4g of H2?Express your answer numerically as the number of molecules.
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07/16/20

what is the new volume, , of the gas?
A sample of gas in a balloon has an initial temperature of 21  and a volume of 1890  . If the temperature changes to 93  , and there is no change of pressure or amount of gas.
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07/16/20

13. NEED HELP FAST

Calculate the pH of a  0.123 M  solution of  NaNO2.  The ionization constant,  𝐾a,  for the acid,  HNO2,  is  4.60×10−4. pH=
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07/16/20

19. NEED HELP FAST

A volume of  500.0 mL  of  0.100 M   NaOH  is added to  535 mL  of  0.200 M  weak acid  (𝐾a=2.96×10−5).  What is the  pH  of the resulting buffer?HA(aq)+OH−(aq)⟶H2O(l)+A−(aq) pH=
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