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A 0.3146 g sample of a mixture of NaCl(s) and KBr(s) was dissolved in water. The resulting solution required 38.50 mL of 0.08765 M AgNO3(aq) to preipitate the Cl- (aq)and Br-(aq) as AgCl(s) and AgBr(s). Calculate the mass percentage of NaCl(s) in the mixture.
What was the percentage by mass of Mg(OH)2 in the original sample? When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride and water.
Draw the major organic product(s) formed when hex-2-yne undergoes hydration in the presence of HgSO4 and H2SO4.
At what temperature (celsius) will the rate constant for the reaction be 140.0 s-1? Use the conversion Kelvin = C + 273.15
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places.
Calculate the initial rate for the formation of C at 25 degrees C , if [A]=0.50M and [B]=0.075M for reaction A+2B
Explain how to prepare 1L of a buffer at pH 7.4 using 1M hypochlorous acid (Ka = 3.5 x 10-8) and a 1 M NaOH solution.
When 25.0 g of ethanol vapor condenses, 23.6 kJ of heat is released. How much heat is required in kJ to vaporize 262 g of ethanol?
NaOH + CO2 -> Na2CO3 + H2O. If the average human body discharges 745 g of CO2 per day, how much NaOH is needed each day for each person in the spacecraft.
How many molecules (not moles) of NH3 are produced from 1.52×10?4g of H2?
A student added 5.85g of KMnO4 to a beaker containing 150ml of 0.200 M KMnO4 solution. Calculate the molar concentration of the final solution. Assume volume remains constant.
The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would make the cations and anions balance?
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.600 g of the isotope to be reduced to 0.310 g by decay.
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