Half life and curie
One curie = 3.7 x 10610 decays per second. The half life of 137Cs is 30 years. When the current activity in such a source is 7.5 micro-curies, determine what will it be in around 15 years?
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Identify the molar mass of the gas measured at the following conditions, 1.05g occupying 2.35L at 37c and 638.4mmHg
The average counting rate of the radioactive sample is around 486 cpm. Determine the probability that in any given 10 second interval one obtains less than 72 counts. Is this similar as the probability of getting less than 72 x 6 = 432 counts in a
Determine the mass of the propane in the flask if a 2.00L flask is filled with propane ga (C3H8) at 1.00 atm and -15.0c.
Determine how many grams of gas are present in a sample the has a mol as mass of 70.0 g/mol and occupies a 2.00L container at 117 kPa and 35.1c?
When radioactive substance provides a counting rate of 1250 cpm at time t = 0, and a counting rate of around 475 cpm at time t = 20 minutes, determine the half life of the substance.
How many milliliters of 3.550M H I (aq) must be added to a solution containing .700 mol of Pb(NO3)2(aq) to completely precipice the lead. Lead iodide is virtually insoluble in water so that the reaction appears to go to completion.
An object consists of a weight of 7.4 N in air. Though, it apparently weighs just 3.3 N if it is fully submerged in water. Determine the density of the object? Represent your answer by using two significant figures.
A mass is joined to a spring on the frictionless horizontal surface. The mass is pulled to stretch the spring by 0.1 m and then gently released. A short time later, as the mass passes via the equilibrium position, its speed is around 1 m/s.
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