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Question: Technetium-99 is widely used to diagnosis in medicine. Its half-life is 6.02 hours. A sample prepared in the early morning for use that day had an activity of 4.59 ?Ci. What will its activity be at the end of the day (8.00 hours later)?
What is the vapor pressure at 75 degrees celcius of an aqueous solution prepared by the addition of 52.9 g of urea CO(NH2)2 to 178 g of water?
Carryout the following conversions. Report your answer to the correct number of significant figures
What is the molarity and osmolarity of a 1 liter solution with .2 moles of calcium chloride. How many molecules of chloride are dissolved in solution
A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature rose from 35.0 to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ/°C, what is the value of DH°rxn. The molar ma..
a 25ml sample taken from saturated solution of caoh2 required 36.0ml of 0.100m hcl to titrate. calculate the
How much heat in kilojoules is evolved in converting 1.50 mole of steam at 150 deg celsiys to ice at -35.0 deg. celsius? The heat capacity of steam is 1.84 J/g. deg celsius.
Propose structures for aromatic hydrocarbons that meet the following descriptions:
The value of delta H for the decomposition of gaseous sulfur trioxide to its component elements, 2SO3 (g) ---> 2S (s, rhombic) + 3O2 (g) is _____ kj/mol.
in an organic compound % of carbon is 75.2%,% of hydrogen is 10.75 and % of oxygen is 14.03..Find the empirical formula of compound?
Then 2.00 mL of solution containing 0.0156 M dopamine was mixed with 90.0 mL of unknown, and the mixture was diluted to 100.0 mL in volumetric flask. The signal from the new solution was 58.4 nA. What is the dopamine concentration in the unknown s..
Research information about the human olfactory system and olfactory receptors. Explain how humans sense odor and clearly identify how different molecular structures influence the odors we can detect. Properly cite your reference source(s) for this..
Determine the excess reactant that is left over after complete reaction with all the limiting reactant.The (s) (g) (s) are subscripts and so are the 2, 2, and 3 that I have in bold
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