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Neptunium-239 has a half life of 2.35 days. How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity?
Thallium has an average atomic mass of 204.3833 u. It has two naturally occuring isotopes, 203Tl (with a mass of 202.9723 u) and 205Tl (with a mass of 204.9745 u). Find the percent abundance of the two isotopes, to ±0.001%.
if 2000 l of hard water contains 0.022 m ca2+ and 0.0070 m mg2+, how many moles of na+ are needed to replace these ions?
a bent molecule a methyl azide has the formula ch3n3 the figure on the right shows how the atoms are connected but not
calculate the pressure in pascals and atmospheres exerted by a mass of 1.0 kg pressing through the point of a pin of
A sample of gas (24.2 g) initially at 4.00 bar was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure was ________ bar.
Claisen reactions use a stoichiometric amount of base and do not polymerize, unlike aldol reactions that use a catalytic amount of base and can polymerize.
Provide the structure of the Claisen's pruduct in the self condensation of methyl phenyl acetate.
If 200. mL of aqueous 0.862 M HCl is mixed with 200. mL of aqueous 0.431 M Ba(OH)2 in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 20.48ºC.
The standard heat of formation \Delta H^\circ _{\rm f} is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard
A beaker of salt water has some solid NaCl at the bottom. What type of solution is in the beaker
The heat capacity of a system is defined as the ratio of the infinitesimal amount of heat absorbed to the corresponding increase in the temperature when some process is carried out. Show that the heat capacity at constant volume is C_V is equal to
Determine the vapour pressure of a solution at 55C that contains 34.2 g NaCl in 375 ml of water. The vapour pressure of pure water at 55C is 118.1 torr. Assume a solution density of 1.00 g/ml.
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