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Question- The half-lives of different radioisotopes are given here: Argon-44, 1/2 Life 12min; Lead-196, 1/2 Life 37 min; Potassium-44, 1/2 Life 22 min; Indium-117, 1/2 Life 43 min. If the initial amount of Argon-44 is 6.4 g, How much Argon-44 is left in the body after 24 min?
Revise your solution from the beginning and check each step carefully.
How much work is done when 18.0 grams of water vaporize at 100.°C under constant external pressure of 1.00 atm. The equation is: w=-P(delta change)V = -1.00atm * 30.62 L = -30.62 L atm ...and the answer is -3.10 kJ... How do you arrive at -3.10kJ ..
What is the balanced chemical reaction resulting when 50 mL of .2 M KCl and 30.0 mL of 0.30 M Pb(NO_3)_2 are added together
a 43 L tank contains a gas under a pressure of 369 atm. What volume would the gas occupy at the same temperature at 710 torr of pressure?
ultisols are an important soil order in this group of soils. describe the typical profile of this soil order paying
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0 C,the volume of the gas is 361 mL. To what temperature must the gas be heated to occupy a volume of 492 mL.
If a fast step precedes a slow step in a twi=o step mechanism, how is the fast step affected. how is this effect used to determine the validity of the mechanism
Question- Arrange the subsequent substances in the order of increasing entropy at 25 degrees Celsius. HF(g), NaF(s), SiF4(g), SiH4(g), Al(s). Lowest to highest.
You are given a stock concentration of alcohol dehydrogenase (ADH). The molecular weight of ADH is 35,000 g/mol. What is the molarity of a 35 mg/mL stock solution of ADH
Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C.
A radiation source has an intensity of 650 rem at 1.0 m, what distance is needed to decrease the intensity of expo- sure to below 25 rem, the level at which no effects are detectable
If methanol were used rather than water in measuring the density of the irregular objects, how would that have affected the result. explain
Calculate the entropy of mixing if two moles of N2(g) are mixed with one mole O2(g) at the same temperature and pressure, assuming ideal behavior.
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