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A sample of N2O3 contains 1.26 moles of nitrogen. Use the following atomic masses: N =14, O=16.
how many moles of N2O3 are there?
A situation with an industrial input of arsenic directly into the lake at 10kg/Day. The lake volume is 1.2 x 10^8 m^3, and the average depth is 10m.
What volume of a concentrated HCl solution, which is 36.0% by mass and has a density of 1.179 g/cm3, should be used to make 5.1 L of an solution with a pH of 1.5.
What is the density of lead if a rectangular bar measuring 0.500 in height, 1.55 in width, and 25.00 in length has a mass of 220.9g.
Determine how many grams of C 6 H 12 O 6 should be mixed in 563 grams of C 2 H 5 OH) to form a 2.40X10^-2 m solution?
If it takes 526 J of energy to warm 7.40 g of water by 17 °C, how much energy would be needed to warm 7.40 g of water by 55 °C?
The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0x10^- 13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm.What fraction of the space within the atom is occupied by the nucleus?
Calculate the mass, in grams for a gold sample that absorbs 225 J to change its temperature from 15 Celsius to 47 degrees celsius.
A certain reaction has ?H equal to 11.57 kJ/mol. This reaction is normally run at room temperature (25?C). At what new temperature should the reaction be run so that K is twice its value at 25?C?
The reading on a mercury manometer at 25 deg C (open to the atmosphere at one end) is 56.38 cm. The local acceleration of gravity is 9.832 m s-2.
an ideal gas with temperature independent Cp = (7/2)R at 15 degrees C and having initial volume 60 m^3 is heated at constant pressure (P =0.1013 MPa) to 30 degrees by transfer of heat from a resivoir at 50 degrees C.
What reagents would you recommend and what mass of each one would you use to match the concentrations of Na+, Cl-, Mg2+, Ca2+ and SO42- given in the table above?
The chemical formula of hydrogen cyanide is HCN. How many unshared electrons are associated with a molecule of hydrogen cyanide.
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