The number of atoms of H in a 70g sample of Ca(SO4)*9H2O
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If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
A 70g steam sample at 150C was converted to ice at 150C.Calculate the total amount of heat removed in the process in question 3. (SH ice = 2.09J/g.C ; SH water = 4.184j/g.C : SH steam = 1.84J/g.C ; H cond= -40.7 kj/mol H freeszing =-6.01kj/mol)
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