11/17/22

How to find out the answer?
when a smaller weather balloon (12.5 L) is full it contains 0.25 mol of helium. However when the technician pulled it out of storage at 25 c its volume was only 8.4 L. Realizing some helium has... more
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11/17/22

Complete and balance the molecular equation for the reaction of aqueous chromium(II) bromide, CrBr2, and aqueous sodium carbonate, Na2CO3. Include physical states.
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11/17/22

2LiCl(aq)+Pb(CH3COO)2(aq)⟶PbCl2(s)+2LiCH3COO(aq) net ionic equation
What is the ionic equation?
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11/17/22

Tell which gas of each pair below would diffuse more rapidly at the same temperature and pressure? He,Ar UF6, Cl2 H2,O2,

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11/17/22

A train travels 20 miles in 40 minutes. What is the speed of the train?

I don't really understand how to do this
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11/17/22

Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the nickel(II) chloride is dissolved in it.
Suppose 6.29g of nickel(II) chloride is dissolved in 50.mL of a 0.70 M aqueous solution of potassium carbonate.Calculate the final molarity of chloride anion in the solution. You can assume the... more
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11/17/22

How many grams of PbF2 (molar mass = 245.2) will dissolve in 550 mL of 0.25 M NaF solution? The Ksp for PbF2 is 2.69e-08.
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11/16/22

Calculate the molarity of the student's sodium hydroxide solution. Be sure your answer has the correct number of significant digits.
A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 378.mg of oxalic acid H2C2O4, a diprotic acid that can be purchased inexpensively in high... more
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11/16/22

Calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change when the barium acetate is dissolved in it.
Suppose 1.15g of barium acetate is dissolved in 350.mL of a 62.0mM aqueous solution of ammonium sulfate.Calculate the final molarity of barium cation in the solution. You can assume the volume of... more
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11/16/22

What volume of concentrated acetic acid ( 17.4 M C H 3 O O H ) will be needed to prepare 5.00 L of 0.100 M acetic acid?
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11/16/22

how many grams of potassium hydrogen phthalate will be required to titrate 50 ml of 0.101 M NaOH solution
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11/16/22

Calculate the molarity of the student's sodium hydroxide solution. Be sure your answer has the correct number of significant digits.
A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 68.mg of oxalic acid H2C2O4, a diprotic acid that can be purchased inexpensively in high... more
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11/16/22

What mass of NO2 can be produced from 5 grams of oxygen
Stiochiometry Pratice questions.
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11/16/22

Chemistry Question
Titanium dioxide is converted to titanium tetrachloride by reaction with chlorine gas and carbon according to the equationTiO2(s) + 2Cl2(g) + 2C(s) --> TiCl4(g) + 2CO(g)Suppose 40.9 g of TiO2(s)... more
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11/16/22

Chemistry Question
Small quantities of chlorine can be prepared in the laboratory by the reaction described by the equation               MnO2(s) + 4 HCl(aq) --> MnCl2(aq) + Cl2(g) + 2 H2O(l)How many grams of... more
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11/16/22

The Henderson-Hasselbalch equation allows you to...
The Henderson-Hasselbalch equation allows you to: calculate the pH of a solution that contains HCH3CO2 and NaCH3CO2 determine the molecular weight of an acid from its pH alone calculate the pH of... more
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11/16/22

Chemistry Question
Potassium nitrate is widely used as a fertilizer because it provides two essential elements, potassium and nitrogen. It is made by mixing potassium chloride and nitric acid in the presence of... more
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11/15/22

How many milliliters of 10.0M HF must be diluted to 500. ml to make a 2.00M solution?
How many milliliters of 10.0M HF must be diluted to 500. ml to make a 2.00M solution?
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11/15/22

Consider the combustion of liquid C₅H₈ in oxygen gas to produce carbon dioxide gas and water vapor.
In an experiment, 0.1063 g of C₅H₈ is combusted to produce enough heat to raise the temperature of 150.0 g of water by 7.630 °C. If -4789 J of heat was produced from the combustion of 0.001561... more
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11/15/22

Using the equations H₂ (g) + F₂ (g) → 2 HF (g) ∆H° = -79.2 kJ/mol C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol 2 C(s) + 2 H₂ (g) → C₂H₄ (g) ∆H° = -97.6 kJ/mol

Using the equations H₂ (g) + F₂ (g) → 2 HF (g) ∆H° = -79.2 kJ/mol C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol 2 C(s) + 2 H₂ (g) → C₂H₄ (g) ∆H° = -97.6 kJ/mol Determine the molar enthalpy (in... more
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11/15/22

Calculate the molarity of the student's sodium hydroxide solution. Be sure your answer has the correct number of significant digits.
A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 68.mg of oxalic acid H2C2O4, a diprotic acid that can be purchased inexpensively in high... more
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11/15/22

Chemistry --> reaction
Hello experts,i would like to ask how can i find the mas of CaS with the moles of calcium by knowing the mass of reagents? Reaction: 2C + Na2SO4 + CaCO3 --> Na2CO3 + CaS + 2 CO2 The mass of... more
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11/15/22

What is the equilibrium constant for the following reaction at standard conditions?
a) Mg (s) + Zn2+ (aq) → Mg2+ (aq) + Zn (s)b) 3 Cl2 (g) + Au (s) à 2 AuCl3 (aq)
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11/15/22

What is the concentration of a dextrose solution prepared by diluting 17 mL of a 5.0 M dextrose solution to 25 mL using a 25 mL volumetric flask?
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11/15/22

Calculate H for the reaction of sulfur dioxide with oxygen.
2SO (g) + O (g)   2SO (g)( H SO (g) = –296.8 kJ/mol;  H SO (g) = –395.7 kJ/mol)
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