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A sample has a mass of m=1g that contains 2 radioactive elements (20% of element one and 80% of element 2) with molar masses of M1=25g/mole and M2=63 g/mole and T1 = 60 s and T2 =12.7 h, respectively. 1. Calculate the number of radioactive nuclei in the sample at t=0 (A0) 2. Calculate the activity of the sample after 6 minutes 3. Calculate the activity of the sample after 63.5 hours 4. What is your conclusion.
basketball with a volume of 3.50 Liters is left in a car when the temperature is 298 K. What will the volume of the ball be as the car heats up to 305 K during the day?
Can someone please show me the product, and the reaction by-product of the following reaction? Please make sure that the reaction is balanced.
A vessel which is 5 m^3 is filled with propylene. The pressure inside the vessel is 470 psi, and the temperature of the vessel is 25 C. A) How many kg of propylene are in the vessel?
draw all the possible steroisomers of 1,2,3,4,5-pentachloropetane and assign configurations to all stereogenic centers. Label each as either optically
why helpful.source site should show IGC,ILC, Trouble shooting and column packing
What is the effect of raising the temperature or increasing the carrier gas flow rate on the ability to resolve two closely
What molarity of aqueous calcium chloride solution can be expected to show the same conductivity as 0.0050 M aluminum sulfate at 12,500 units.
A sunscreen preparation with a density of 2.82 g/mL contains 3.55% by mass zinc(II) oxide. Each tube is filled with 185.0 mL of sunscreen. If you are the manufacturer and use 5.00 lb of zinc(II) oxide.
A bicyclist passes beneath it, traveling in a straight line at the constant speed of 10 m/sec. How fast is the distance between the bicyclist and the balloon increasing 2 seconds later?
List several reasons animals that live in cold climates have higher levels of unsaturated fatty acids in their extremities compared to the rest of their body - explain why this is.
Energy level of electrons in atoms - The 3s level in hydrogen has a lower energy than the3d level in hydrogen.
calculate the concentration of an naoh solution if 25.0ml of the solution is needed to neutralize 17.5ml of a 0.419m
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