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Saltpeter is a compound made of potassium (K), nitrogen (N), and oxygen (O). Every 100.00 g of saltpeter contains 38.67 g potassium and 13.86 g nitrogen. What is the mass of oxygen contained in 316.0mg of saltpeter?
The absorbance of monensin, a UV-absorbing compound, is used to measure its concentration in a pharmaceutical preparation. Calculate concentration, and the uncertainty in concentration.
Calculate the value of delta S when 1.85 mol CH3OH (l) of is vaporized at 64.7 C. The normal boiling point of methanol is 64.7 C.
calculate the root mean square speed and its average kinetic energy per molecule of nitrogen and water vapor.a
An unknown gas effuses through a porous barrier at a rate that is 0.752 times the rate of Ar (g) under the same conditions
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 50.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles.
calculate the percent (by volume) of air that is displaced if all of the liquid nitrogen evaporates.(liquid nitrogen has a density of 0.807 g/mL)
Define the human eye is a complex detector for visible light. The optic nerve requires a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that ultimately reach the brain. Explain how many photons of blue light 9 475 nm) are neede..
A mixture of 0.074 mole H2 and 0.151 mol CH4 is at equilibrium with solid carbon in a 1 liter container. If the equation for the equilibrium is CH4(g) ?C(s) + 2H2(g). (a) Explain what is the value for Kc
A 0.542 g sample of an unknown monoprotic weak acid requires 28.67 mL of 0.1093 M NaOH for neutralization. What is the molar mass of the acid
Explain the oxidation states of carbon, particularly relating to alcohols, aldehydes and ketones, acids, and anhydrides.
The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the environment. Therefore, two containers of waste solution are separated by a semipermeable membrane and pressure is applie..
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