Question
In: Physics
A piece of charcoal has a mass of 25 g and is known to be about...
A piece of charcoal has a mass of 25 g and is known to be about 10,000 years old.
(a) What is the expected number of decays per minute from this sample?
(b) Background radiation gives about 20 spurious counts per minute in a typical counter used for carbon dating. If the number of carbon decays per minute is much smaller than this, it is difficult to accurately determine the age of a sample. Estimate the maximum age (in years) of a 25 g sample for which carbon dating could be used.
Solutions
genius_generous answered 2 years agoRelated Solutions
An old piece of wood has a carbon mass of 124 g and an activity of...
An old piece of wood has a carbon mass of 124 g and an activity
of 13 Bq. How old is the song? The radioactive isotope of natural
carbon has f = 1.3⋅10−12 parts and has a half life of 5730 years.
The average for the year is 3.156⋅107 seconds. Please give your
answer in years (ie a).
A 25 g piece of metal is dropped into 100.0 g sample of water. The water...
A 25 g piece of metal is dropped into 100.0 g sample of water.
The water temperature drops by 5.0 C. The piece of metal's
temperature increases by 85 C. What is the specific heat of this
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A single charcoal briquette has a mass of 0.1 kg, and is made up of almost...
A single charcoal briquette has a mass of 0.1 kg, and is made up
of almost entirely carbon. I want to burn that briquette in air in
a sealed oven. When the combustion is complete, the gases in the
oven will include CO2, O2, and N2, and the mole fraction of CO2 in
this exhaust is 5%. How much air is needed (before the combustion)?
Give your answer as kg, kg mole, and as a volume in m3 . Assume...
A single charcoal briquette has a mass of 0.1 kg, and is made up of almost...
A single charcoal briquette has a mass of 0.1 kg, and is made up
of almost entirely carbon. I want to burn that briquette in air in
a sealed oven. When the combustion is complete, the gases in the
oven will include CO2,O2,and N2, and the mole fraction of CO2 in
this exhaust is 5%. How much air is needed (before the combustion)?
Give your answer as kg, kg mole, and as a volume in m^3. For the
last part,...
A tablet of Benadryl (R), an antihistamine, has a mass of 0.49 g. It contains 25...
A tablet of Benadryl (R), an antihistamine, has a mass of 0.49
g. It contains 25 mg of the active ingredient, diphenhydramine HCL.
What percent of the tablet is active ingredient?
7. A piece of zinc metal with a mass of 35.0 g is heated in boiling...
7. A piece of zinc metal with a mass of 35.0 g is heated in
boiling water to 101.3 ºC and then dropped into a coffee-cup
calorimeter containing 75.0 g of water at 23.8 ºC. When thermal
equilibrium is reached, the final temperature is 27.0 ºC. Calculate
the specific heat capacity of the zinc.
A 25 g piece of hot iron is dropped into a glass of ice water containing...
A 25 g piece of hot iron is dropped into a glass of ice water
containing 15.0 g of ice and 50.0 g of water. If the iron loses
8.00 kJ of energy to the ice water in achieving equilibrium, what
is the equilibrium temperature? ∆Hfus = 6.01 kJ/mol
A generic salt, AB3, has a molar mass of 185 g/mol and a solubility of 5.50 g/L at 25 °C.
Part A)A generic salt, AB3, has a molar mass of 185 g/mol and a solubility of 5.50 g/L at 25 °C. AB3(s) ⇌ A3+ (aq) + 3B-(aq) What is the Ksp of this salt at 25 °C?Part B)A generic salt, AB2, has a molar mass of 271 g/mol and a solubility of 2.30 g/L at 25 °C. AB2(s) ⇌ A2+(aq) + 2B- (aq) What is the Ksp of this salt at 25 °C? Part C)At 25 °C only 0.0890 mol of the generic salt AB3 is...
Problem 10.67 A piece of solid carbon dioxide with a mass of 5.70 g is placed...
Problem 10.67
A piece of solid carbon dioxide with a mass of 5.70 g is placed
in a 10.0-L vessel that already contains air at 715 torr and 22 ∘C
.
Part A
After the carbon dioxide has totally vaporized, what is the
partial pressure of carbon dioxide in the container at 22 ∘C ?
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Part B
After the carbon dioxide has totally vaporized, what is the
total pressure in the container at 22...
A piece of metal (mass = 18.300 g) is placed in 11.00 mL of chloroform (d...
A piece of metal (mass = 18.300 g) is placed in 11.00 mL of
chloroform (d = 1.498 g/mL) in a 25-mL graduated cylinder. The
chloroform level increases to 15.46 mL. The best value for density
of this metal from these data is
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