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What is the probability of a 14C decay taking place in the lungs during a single breath? The atmosphere is about 0.04% CO2, and in an average breath we inhale about 0.5 l of air and exhale it about 3.5 s later. The isotopic abundance of 14C is approximately 10-12.
When 1 mole of n-propylbromide is mixed with 1 mole of ammonia in a convenient solvent, only 50% conversion is achieved (ie, only 0.5 mol of ethylamine is formed) unless also 1 mol of a base,
briefly explain how you will isolate p-tert-butylphenol after you have extracted it into NaOH solution.
What happens when the base solution was added to the acid solution but was not stirred while temperature measurements were made
The normal boiling point for acetone is 56.5 C. At an elevation of 5300 ft the atmospheric pressure is 630 torr. What would be the boiling point of acetone Hvap = 32.0 kJ/mol at this elevation
A 1.00-mol sample of an ideal monatomic gas is compressed isothermally and irreversibly in one step from 2.50 atm to 6.50 atm at 300.0 K. Calculate G for this process.
An element has three naturally occurring isotopes with the following masses and abundances (in parenthesis): 27.977 amu (0.9222); 28.974 amu (0.0469); 29.974 amu (0.0310). Calculate the atomic weight of the element.
Consider two DNA molecules: one 400 base pairs long, the other 800 base pairs long. Assuming that each is a rigid rod of diameter 25 Å, with a length of 3.4 Å per base pai.
A syringe filled with air can be used to test the relationship between the temperature and the volume of a sample of gas. The syringe has a movable plunger that allows an enclosed sample of gas to be held at a constant external pressure, so the ga..
Chemistry: Change in Temperature in the Production of Silver Chloride, When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates:
The rate constant for a first-order reaction is 5.50 x 10-4 s-1 at 39oC and 2.32 x 10-3 s-1 at 56oC. What is the activation energy
Explain why the melting temperature of a double-helical DNA increases when the Na+ concentration increases.
what is the molarity of the solution formed by mixing 0.20 mol of sodium hydroxide with enough water to make 150 ml of solution
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