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The half of cesium-137 is 30.2 years. If the initial mass of sample of cesium-137 is 1,000 g, how much cesium will remain after 151 years?
Octane (C8H18) undergoes combustion according to the following thermochemical equation: 2C8H18(l) + 25O2(g) ? 16CO2(g) + 18H2O(l) ?H°rxn = -11,020 kJ/mol. Given that ?H°f[CO2(g)] = -393.5 kJ/mol
We have a 100mL 0.2M AgNO3 solution and a 100mL 0.2M CH3COONa solution. Please describe how to prepare a 35 mL mixture solution containing 60mM AgNO3 and 140mM CH3COONa?
Find the concentration and pH solution - What is the pH of a solution of 0.65 M acid and 0.51 M of its conjugate base if the pKa = 5.30?
The Clean Air Act mandates that certain metropolitan areas must add oxygenates to the gasoline that is sold in that area. What is the reason that oxygenates are added to gasoline?
the standard molar enthalpy of vaporization for water is 40.79kj/mol. what mass of steam is required to release 500. kj of energy upon condensation.
Separation of acetone from water by using MIBK - How much MIBK must be used if the final acetone concentration in the water-rich phase is 5 wt%?
An experiment requires 46.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder.
A sample of 0.0020 mole of HCl is dissolved in water to make a2000-mL solution. Calculate the molarity of the HCl solution,the [H3O+], and the pH.
Calculate the pH of a solution when 0.200 moles of solid NaOH is added to 2.00 liter of 0.250 M HCl. Assume no change in volume.
What is the molarity of the Na 2 S 2 O 3 solution if a 0.150 g sample of KIO 3 required 10.7 mL of Na 2 S 2 O 3 solution for its standardization?
Using a liquid sample of Na that has a molar heat of fusion of 2.06 kj/mol calculate the number of moles in a liquid sample of Na if sample releases 41.4 kj when it freezes?
The half-life of nuclium is 12.3 years. If 49.0 mg of nuclium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 98.4 years.
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