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The half-life of a certain radioactive element is 1250 years. What percent of the atoms remain after 7500 years?
N2 is .070 moles, O2 is 0.35 moles and CO2 is 0.20 moles, the total is pressure 1.55 atm what is the pressure of N2?
What is the pressure in a 17.1 L cylinder filled with 47.9 g of oxygen gas at a temperature of 341 K?
When a 0.369 g sample was studied by combustion analysis, 0.662 g of CO2 and 0.0897 g of H2O formed. How many moles of each of the following were in the original sample? C: ? H: ? Cl: ? What is the molecular formula?
a 100.0 ml aliquot of .200 M aqueous potassium hydroxide is mixed with 100.0 ml of .200 M aqueous magnesium nitrate. what mass of precipitate is formed? what is the concentration of each ion remaining in the soulution after the reaction is complet..
Thirteen grams of titanium react with 60.0 g of bromine. How many grams of titanium(IV) bromide are produced, assuming 100% yield.
How much energy (in kilojoules) is required to convert 205 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
Calculate the enthalpy change for converting 10.00g of ice at -25.0°C to water at 70.0°C in kJ. The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K, and 1.84 J/g-K,.
In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 23.0 mi/gal, how many liters of gasoline would you need to buy to complete a 142-km trip in Europe?
suppose .853L of H2 is collected at 15 degrees celcius and 782 mmHg. how much electricity in coulombs must have passed through the solution
A certain amount of glucose, C6H12O6 burned in oxygen, and produced 22 grams of carbon dioxide, CO2. How many grams of water was produced at the same time?
A balloon was filled to a volume of 2.50 L when the temperature was rm 30.0 C. What would the volume become if the temperature dropped to rm 11.0 0C.
would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions.
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