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"A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register 160 counts per minute. Eight hours later the detector counts at a rate of 10 counts per minute. What is the half-life of the material?"
calculate the number of excess reagent units remaining when 100 C4H10 molecules and 611 O2 molecules react?
Determine the energy of an electron in the given quantum level of each of the following ions. (Hint: Each of the ions has a different number of protons
What mass of this substance must evaporate in order to freeze 150g of water initially at 15C? (The heat of fusion of water is 334J/g the specific heat of water is 4.18J/g*K.)
The valve between these Tanks X and Y is opened and the gases are permissible to mix. After the gases have had time to mix, calculate the partial pressure of the oxygen gas?
Determine the calorimeter constant or eat capacity, for this calorimeter if the specific heat for water= 4.184 J/goC.
If you drop 25 g warm nails initial temp 65.4 into coffee cup calorimeter that contains 100.0 g water at 20 degrees Celsius, what will the temperature be.
The recommended dose is 10 body weight. How many of this suspension should be given to an infant weighing 16
Determine the partial pressure of oxygen O2 If the total pres- sure =80 torr, the partial pressure of CO=330 torr and the CO2 has a partial pressure = 330 torr?
Converting liquid H2O to solid ice releases 1.44 kcal/mol. How many k/cal are released by freezing 1.4 mol of H2O?
Single double triple bonding, Explain the characteristics of a single, double, and triple bonds including why they form and how the electrons
2K(s)+2H2O(l)--> 2KOH(aq) + H2(g) A 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg C. What is the final temperature of the water after the preceding reaction occur.
You have 75.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 1.52 M solution of AgNO3(aq). Calculate the concentration of CrO4 2- after the two solutions are mixed together.
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