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The half-life of a certain radioactive element is 1250 years. What percent of the atoms remain after 7500 years?
I know it is a dilution problem but I am lost other than that. Please help. The concentrations and final volumes were given in a table and paired by the way.
Using a sample of 350. mL air is collected at 35 Celsius has a pressure of 550. torr. if it is allowed to expand to 425 mL at 57 Celsius then What pressure will the air exert?
determine the partial pressure and the total pressure in a 2.50 L vessel containing the following mixture of gases at 17.8 degrees celsius
An ore containing 24% solid inert and 76 mol% iron pyrites (FeS2) is roasted in the presence of dry air at 500 °C and 1 atm. Considering the given reactions.
what volume of 0.366M Ni(NO3)2 is required to completely react with 55.8 ml of 0.500M Na2CO3.
For the equilibrium H2+CO2-> Kc= 3.18 at 1106K. If each of the 4 species was initially present at a concentration of 3.000M.
If 175 g of X reacts completely with diboron trioxide to produce 2.43 mol of B4X3, what is the identity of X?
How much heat (in kJ) is evolved in converting 1.00mol of steam at 130.0C to ice at -50.0C? The heat capacity of steam is 2.01 and of ice is 2.09 .
A flask contains 0.180 mol of liquid bromine, Br_2. Determine the number of bromine molecules present in the flask.
If 5.78 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 = CO2 + H2O how much oxygen is required?
Calculate the binding energy E B of the helium nucleus 4 /2 He .Express your answer in millions of electron volts to four significant figures.
Zinc chloride (ZnCl2) is 52.02% chlorine by mass. What mass of chlorine is contained in 66.0 g of ZnCl2?
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