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Oxygen-15 has a half-life of 124 seconds. You begin with a 429 mg sample of oxygen-15. You wait 6.20 minutes. What is the total amount of time in seconds? (do not include units in the box; enter your answer to 3 sig figs) How many half-lives occur? (do not include units in the box; enter your answer to 1 sig fig) How many milligrams of O-15 remain after 6.20 minutes? (do not include units in the box; enter your answer to 3 sig figs)
What mass of this substance must evaporate in order to freeze 160 g of water initially at 21 0C? (The heat of fusion of water is 334 {J/g}; the specific heat of water is 4.18 {J/g c.K}.)
statements is true concerning the applicability of the E1, E2, SN1, and SN2 mechanisms to reactions
You take 3.1789 g of a substance and place it into 100.0 g of benzene. The boiling point of this solution is found to be 80.5464 C. What is the approximate molar mass of the substance? Bp of CCl4 is 80.1 C and the Kb is 2.53 C/m
Suppose you started with 2.6 M of HCN(aq), what would be the molar concentration of HCN(aq) at 20 days?
how many liters of H2 would be formed at 528 mm Hg and 12 degrees celcius if 28.0g of zinc was allowed to react
What is the final concentration of copper in the flask b)what is the uncertainty in the value of the copper concentration?
Calculate the pH after 0.020 mol NaOH is added to 1.00 L of a solution which is 0.100 M NH2OH and 0.100 M HONH3Cl.
What is the molality if a solution in which 15 g of I2 is dissolved in 500. g of alcohol?
It is desired to inflate a baggie with a volume of 869 milliliters by filling it with hydrogen gas at a pressure of 0.847 atm and a temperature of 296 K. How many grams of H2 gas are needed? answer in g please
The specific heat of iron is 0.451 J/g·°C. If 12.04 kJ of heat energy are applied to 180.0 g of iron at an initial temperature of 22.0°C, what is the final temperature of the iron
15.0 moles of gas are in a 6.00 L tank at 24.1 degrees C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constantsfor methane are a = 2.300 L^2 atm/ mol^2 and b = 0.0430 L/mol
A piece of ice weighs 35.0 g. how much energy is required to heat the ice from a solid at -5.0 degrees C to liquid water at 65.0 degrees C?
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