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Problem- The half life of iodine 131, also called radio iodine is 8.02 days. How much iodine-131 will remain after two half lives in a sample that initially contains 5.0g of the nuclei de? Please give detailed explanation.
You must show your work in an efficient manner so I can understand it in clearly
What is the final concentration if 75.0 mL of a 3.50 M glucose solution is diluted to a volume of 400.0 mL?
if you wanted to prepare a solution of co in water at 25 in which the co concentration was 2.1 mm what pressure of co
Suppose that 4.13 L of methane at a pressure of 800. Torr is transferred to a vessel of volume 2.42 L. What is the final pressure of methane if the change occurs at constant temperature
Select 10 reactions that produce a precipitate, color change or gas and state balanced chemical equation and a net ionic equation for each. Keep in mind a reaction may be indicated by the formation of a precipitate, color change, or the formation ..
The high-field:low-field integration ration is 2:1. Deduce the structure of the organic hald and explain the NMR signals. I'm thinking it's 1,1-dichloropropane.
Problem- 1CaC 2 (s)+2H 2 O(l)?1C 2 H 2 (g)+1Ca(OH) 2 (s) If the acetylene were burned to form water and carbon dioxide, how many kilojoules of energy would be produced from the complete reaction of 23g of calcium carbide
Assuming the density of a 5% acetic acid solution is 1.0 g/ml, determine the volume of the acetic acid solution necessary to neutralize 25.0 ml of .10M NaOH. Also record this calculation on your report sheet.
How many grams of Sodium Preoxide are needed to produce 3.20 grams of oxygen. How many grams of phosphoric acid are needed to produce 3.75 grams of calcium phosphate
estimate how much arginine stabilizes the negative charge of the succinate
What is the name of the chemical formula Tl2Se. Does Tl have a +2 charge Tl (II)? Do all Roman numerals in chemistry have a positive charge
The standard enthalpy of formation of Zn^2+ (aq) is -153.9kJ/mole. How much heat is evolved when 0.3724 g of Zn(s) reacts with excess hydrochloric acid
The measured boiling point of the solution was 65.46 °C. Calculate the molecular weight of the unknown substance.
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