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Calculate the molarity of a solution made by adding 28.4mL of concentrated potassium hydroxide(34.5% by mass, density 1.46g/mL) to some water in volume metric flask, then adding water to the mark to make exactly 250mL of solution.
A student reacted 0.22 g of zinc (Zn) with excess hydrochloric acid (HCl) to generate hydrogen gas (H2).
Describe the uniqueness principle and explain the three principal reasons why second period elements are notably different from their heavier counterparts.
A room contains 45 kg of air.How many kilowatt-hours of energy are necessary to heat the air in the house from 5 C to 29 C? The heat capacity of air is 1.03 J/ g C.
Ammonia reacts with diatomic oxygen to form nitric oxide and watervapor. When 40.0g of ammonia and 50.0 g of oxygen are mixed and allowed to react, which is the limiting reagant? 4NH3 +5O2--> 4NO + 6H2O
Phosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in studies of nucleic acids. The half-life of phosphorus-32 is 14.3 days. What mass of phosphorus-32 is left from an original sample of 195 mg of Na332PO4 a..
Lindane is a popular pesticide throughout the south because it is a persistent chemical (i.e. it remains in the environment and offers protection for a long period of time)
If the mass of water surrounding the calorimeter was exactly 1000 g and the heat capacity of the bomb calorimeter without the water was 1.75 kJ/degrees Celsius, calculate the molar heat of the combustion of methanol
Ammonia and oxygen react to form nitrogen and water. How many grams of N2 can be produced when 6.30g O2 reacts?
A titration required 18.38 mL of 0.1574 M NaOH solution. How many moles of NaOH were in this volume?
Data: 2Ba(s) + O2(g) => 2BaO(s) ?H = -1107.0 kJ Ba(s) + CO2(g) + 1/2O2(g) => BaCO3(s) ?H = -822.5 kJ Given the data above, calculate ?H for the reaction below
The partial pressure of the H2 is 1.9 atm, and the partial pressure of the Ne is 3.4 atm. What is the mole fraction of H2?
The equilibrium constant, Kc, for this reaction is 4.6 x 10^ -3 N2O4(g) 2NO2(g) If the equilibrium contains 0.050 M NO2, what is the [N2O4]
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