04/30/22

Plz help. half-life
Radium-223 decays with a half-life of 11.4 days.How long will it take for a 0.240-mol sample of radium to decay to 7.50*10^-3 mol? 
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04/30/22

Calculate the partial pressure of CO2. Determine the mole fractions.
(a) A gas mixture contains CO2 and N2 in a 15.90 L gas cylinder at 35°C, and the total pressure is 29.75 atm. There is 7.152 mol N2 in the gas mixture. Calculate the partial pressure of... more
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04/30/22

Plz help don't know
Iodine-131 is often used in nuclear medicine to obtain images of the thyroid.If you start with 4.0*10^10 I-131 atoms, how many are left after approximately 1 month? I-131 has a half-life of 8.0 days.
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04/30/22

A 1.75 L vessel contains 3.60 g of a gas at 1.25 atm and 31.0°C.

Calculate the density of the gas in g/L What is the molar mass of the gas? 
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04/30/22

Plz help. Write isotope A,Z,X
Write the isotope needed, by identifying A, Z, and X, to balance the following nuclear fusion reaction:21H+21H-->11H+AZXExpress your answer as an isotope using prescripts.
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04/29/22

Maximum Concentrations Using Ksp
Barium hydroxide (Ba(OH)2) has a Ksp of 2.55x10-4 at 25 oC. Using an ICE / RICE table, answer the following:  Give your answers to the nearest 0.000 1 M. The maximum concentration of OH- ions in... more
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04/29/22

Explain why you want to add smaller volumes of the basic solution near the equivalence point. What would happen if you added a large amount of base near the equivalence point?

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04/29/22

May I get help on this
A galvanic (voltaic) cell consists of an electrode composed of chromium in a 1.0M chromium(III) ion solution and another electrode composed of copper in a 1.0M copper(II) ion solution, connected by... more
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04/29/22

When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO₃ (aq) → Cr(NO₃)₃ (aq) + 3 H₂O (l) + 3 NO₂ (g) Calculate the volume of NO₂ gas (in L) collected over...
When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO₃ (aq) → Cr(NO₃)₃ (aq) + 3 H₂O (l) + 3 NO₂ (g) Calculate the volume of NO₂ gas (in L) collected over... more
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04/29/22

A 15.4 mL aliquot of methylamine that has a concentration of 0.463 M will be titrated with 1.58 M HCl. Calculate the pH at the equivalence point.

The Kb at the temperature of the experiment is equal to 4.27 x 10^-4. kw=1.00 x 10^-14
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04/29/22

A 29.2 mL aliquot of carbonic acid that has a concentration of 0.637 M will be titrated with 0.358 M NaOH. Calculate the pH of the solution upon the addition of 8.52 mL of NaOH.

The Ka of the acid at the temperature of the experiment is 4.95 x 10^-7
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04/29/22

When 19.16 mL of NaOH is titrated with 0.82 M HCl, 13.48 mL of HCl are required to reach the equivalence point. What is the concentration (molarity) of the NaOH solution?
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04/28/22

HELP WITH CHARLES LAW PLS
A 5.86 L balloon at room temperature (20°C) is placed in a supercool freezer al 260 k.What is the balloon's new volume?
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04/28/22

HELP IN CHEM AVOGADRO LAW!!!
If 0.5 mol Argon gas occupies a volume of 8 L at STP what volume of gas would 30 grams of Argon gas have under the same conditions? (The molecular weight of Argon is 39.95 g/mol)
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04/28/22

Help with Dalton’s law pls
(Note: The pressure of Water at 20.0 degrees Celsius Is 17.5 torT)Some hydrogen gas is collected over water al 20.0 degree calsius. The levels of water Inside and outside the bottle are the same.... more
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04/28/22

If 17.50 grams of a barium sulfate precipitate are produced, find the number of moles of Barium Nitrate that reacted.
If 17.50 grams of a barium sulfate precipitate are produced, find the number of moles of Barium Nitrate that reacted.Formula: CaSO4 (aq) + Ba(NO3)2 (aq) --> BaSO4 (s) + Ca(NO3)2
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04/28/22

If ∆G° = 18.1 kJ/mol, determine the value of ∆G assuming that a mixture contains 57.6 g of NiO, 182.3 g of Ni, 0.24 atm of NH₃, 8.54 atm of N₂ and 10.07 atm of H₂O.
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04/28/22

Plz help dont understand.
Enter a nuclear equation for the alpha decay of each nuclide.Part APo-214Part BPo-210Part CTh-227
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04/28/22

Provide a symbol for isotope of lead contain 128
Provide a symbol for the isotope of lead that contains 128 neutrons.Express your answer as an isotope.
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04/27/22

Stoich question
In a soda-acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide to produce carbon dioxide, sodium sulfate, and water._____H2SO4 +... more
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04/27/22

gas law and stoitamoetry
Solid ammonium chloride, NH4Cl,  is formed by the reaction of gaseous ammonia, NH3 and hydrogen chloride, HClNH3(g)+HCl(g)⟶NH4Cl(s) A 6.89 g sample of NH3 gas and a 6.89 g sample of HCl gas are... more
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04/27/22

Gas Laws using Stoichometry
Hydrazine, N2H4, reacts with oxygen to form nitrogen gas and water.N2H4(aq)+O2(g)⟶N2(g)+2H2O(l)If 3.85 g of N2H4 reacts with excess oxygen and produces 0.650 L of N2, at 295 K and 1.00 atm what is... more
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04/27/22

Complete and balance the redox reaction in basic solution
MnO4^-(aq)+C2O4^2-(aq)--->MnO2(s)+CO2(g)
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04/27/22

Complete and balance the half-reaction in acidic solution
S2O3^2- (aq)------->S4O6^2-(aq)
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04/27/22

Complete and Balance the redox reaction in acidic soln.
BiO3 ^- (aq)+S2O3 ^2- (aq)----->Bi^3+ (aq)+S4O6 ^2- (aq)
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