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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.
Calculate the osmotic pressure associated with 50.0 g of an enzyme of molecular weight 98,000 g/mole dissolved in 2600 mL in of benzene at 30.0 degree celcius
Recall "living" carbon samples show 15.3 d/min*g (carbon). note: CaCO3 is 12.00% carbon, and 14C has a half-life of 5730yr.
How many equivalents of electrons were delivered to the unknown soln? What is the normality of the unknown solution?
The active ingredient in acetylsaliclic acid was isolated. What does it mean is my experimental melting point range was very broad and was also lower than the literature melting point
Explain what is the molality of a solution that contains 3.0g urea (molecular weight=60 amu) in 100g of benzene
The following heats of formation are used to find the change in enthalpy for the formation of tin chloride in the following reaction Sn (s) + 2Cl2(g) --> SnCl4(l).
The pressure of the vapor of the unknown liquid in this experiment was taken to be equal to the atmospheric pressure in the laboratory. why?
Oxalic acid (H2C2O4) is a useful primary standard for standardizing solutions such as potassium permanganate (KMnO4). In a particular standardization experiment 29.00g of oxalic acid, is titrated with 243.00mL of permangante solution
Calculate ?Go and Kp for the following equibibrium reaction at 25'C/ The ?Gf o values are 0 for Cl2(g), -286 kJ/mol for PCl3(g), and -325 kJ/mol for PCl5(g). b) calculate ?G for the reaction if the partial pressures of the initial mixture are PPCl..
what is the main purpose of scratching beakers wall during the synthesis of the
An environmental chemist sampling industrial exhaust gases from a coal-burning plant collects a CO2-SO2-H2O mixture in a 21-L steel tank until the pressure reaches 850 torr at 45oC.
Identify the C-H out of plane bending vibrations in the infrared spectrum of 4-methylcyclohexene. What structural information can be obtained from these bands
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