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Boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. The average molar mass of boron is 10.81 u. What is the percent abundance of each isotope?
2KClO3 + heat > 2KCl + 3O2, How many moles of O2 form as 3.0 mol of KClO3 are totally consumed.
Compute the pH if NaOH solution of the 10.00 mL has been mixed. pKa of HCOOH = 3.74
Calculate the concentration of ions in the following saturated solutions. Al3+] in Al(OH)3 solution with [OH -] = 2.6 10-9 M
How many grams of calcium chloride should be formed from the reactions of hydrochloric acid and calcium hydroxide? If the reaction in 2.4 only produces 3.0 g calcium chloride, calculate the percentage yield of calcium chloride.
If the density of the solution is 1.1094 g/mL, what is the molarity of the sulfuric acid?
If a sample containing 2.03 mL of nitroglycerine (density = 1.592 g/mL) is detonated, how many total moles of gas are produced?
Ammonia reacts with oxygen according tot he following equation: 4NH3+5O2=4NO+6H2O deltaHrxn = -906kJ Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
2 FeBr3(aq) + 3 Na2CO3(aq) Fe2(CO3)3(s) + 6 NaBr(aq) what is the net ionic eqation for this molecular equation.
How many grams of NH4Cl must be added to 424 mL of a 0.69 M solution of NH3 to prepare a pH = 9.00 buffer.
Calculate the entropy change when 1.86 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g) ! 2H2O(l) at 298 K and 1 atm pressure.
How many liters of 13.5 molar HCl stock solution are needed to make 10.5 liters of a 1.8 molar HCl solution?
A 670 mL gas sample at STP is compressed to a volume of 284 mL, and the temperature is increased to 20C. What is the new pressure of the gas in Pa? Answer in units of Pa.
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