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A sample of zinc nitride, Zn3N2, contains 39.0 g of zinc. How many nitride ions are present?
What mass of calcium chloride is dissolved in 100. mL of a 1.20 M solution of calcium chloride
A student accidentally mixed small pure white crystals of napthalene into a small vial containing small white crystals of disodium malonate. What can she do to purify the disodium malonate away from the naphtalene quickly
Atmospheric pollution is a problem that has recieved much attention. not all pollution, however, is from industrial sources. Volcanic eruptions can be a significant source of air pollution.
A certain reaction, a+b=c is the first order with respect to each reactant, with k=1.0x10-2l.mol-1s-1. Calculate the concentration of A remaining after 100s if the initial concentration
the freezing point of the solution is lowered by 4.10 °C. The freezing point and Kf constant for cyclohexane can be found here. Calculate the molar mass of quinine
What is the pH during the titration of 25.00mL of 0.10M NH3 (Kb = 1.8 x 10-5) after the addition of 10.00mL of 0.10M HCl titrant?
Calculate the molar density at this pressure at 310. What fraction of the gas phase molecules initially present for 1.0 in the chamber are present at
A piece of metal weighing 10.0g is raised in tempreture from 25 C to 76.5C. it is found that it absorbed 47.6 calories of heat in the process.
Perkin and related reactions, There are numerous condensations that are closely related to the Perkin reaction
determine the molarity of each of the ions present in the following aqueous salt solutions.
When 0.0024 moles of a weak acid are dissolved in enough water to make 0.500 L, the pH of the resulting solution is 5.28. Calculate Ka.
Container A holds 712 mL of ideal gas at 2.10 atm. Container B holds 164 mL of ideal gas at 4.50 atm. If the gases are allowed to mix together, what is the resulting pressure
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