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What type of radioactive decay is involved in carbon
dating? Explain the process of carbon dating.
In a certain Algebra 2 class of 27 students, 11 of them play basketball and 13 of them play baseball. There are 5 students who play neither sport. What is the probability that a student chosen randomly from the class plays basketball or baseball?
Cobalt-60, with a half-life of 5.3 years, has a number of
applications, including medical therapy and the sterilization
of medical tools. Determine the mass of a 50 g sample that
would remain after
(a) 6 months
(b) 5 years
The reaction between hydrochloric acid and aluminum produces hydrogen gas and aluminum chloride. How many moles of H2 can be obtained when 2.80 mol HCl reacts with an excess of Al?
6HCl+2Al⟶3H2+2AlCl3
The combustion of ethane (C2H6) produces carbon dioxide and steam.
2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g)
How many moles of CO2 are produced when 5.55 mol of ethane is burned in an excess of oxygen?
For the chemical reaction
Na2CO3+Ca(NO3)2⟶CaCO3+2NaNO3
how many moles of calcium carbonate (CaCO3) are produced from 6.0 mol of sodium carbonate (Na2CO3)?
Nitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia.
N2(g)+3H2(g)⟶2NH3(g)
Assume 0.190 mol N2 and 0.599 mol H2 are present initially.
After complete reaction, how many moles of ammonia are produced?
How many moles of H2 remain?
How many moles of N2 remain?
What is the limiting reactant?
Glucose, C6H12O6, is used as an energy source by the human body. The overall reaction in the body is described by the equation
C6H12O6(aq)+6O2(g)⟶6CO2(g)+6H2O(l)
Calculate the number of grams of oxygen required to convert 58.0 g of glucose to CO2 and H2O.
Calculate the number of grams of CO2 produced.
Iodine is prepared both in the laboratory and commercially by adding Cl2(g) to an aqueous solution containing sodium iodide.
2NaI(aq)+Cl2(g)⟶I2(s)+2NaCl(aq)
How many grams of sodium iodide, NaI, must be used to produce 53.4 g of iodine, I2?
Consider the reaction shown.
4HCl(g)+O2(g)⟶2Cl2(g)+2H2O(g)
Calculate the number of grams of Cl2 formed when 0.225 mol HCl reacts with an excess of O2 .
