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Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm) per gram of carbon. If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5,730 yr)
a certain substance has a molar enthalpy of vaporization of 31.6 kj mol. How much of the substance is in a sample that requires 57.0kJ to vaporize?
Based on the mass of caffeine, you can now determine the % weight of caffeine in the original tablet. How does this compare with what the packaging states?
when measured in aa quartz cuvett of 1cm path length. What is the concentration of DNA in µg/mL?
What is the pH of 50 mL of .122M sodium glycinate titrated with .100M HCL at second equivalence point
A balloon is filled to a volume of 9.00 multiplied by 102 mL at a temperature of 18.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 multiplied by 102 K. What is the final volume of the balloon?
Consider the weathering reaction describing the breakdown of K-feldpar to form the clay mineral kaolinite, a reaction of particular importance in tropical soils
Assuming that the pressure and amount of a gas sample remain constant, what will be the final volume of a 3 .84 L sample of a gas originally at 160 0C when heated to 280 0C
What is the mass concentration of oxygen in the mixture? (Note that the vast majority of oxygen is bound to other atoms.) Give answer in g/L, 2 significant digits.
the ksp of agcl is larger than the ksp of k2cro4,yet k2cro4 is more soluble than agcl. explain the fallaciousness of the statement.
A 0.0050 molar solution of sugar is separated from pure water by a membrane at 20 C. What is the osmotic pressure?
Under what conditions can you ensure that substitution will predominate and under what conditions can you ensure that elimination will predominate?
The visual raw meat color was red(outside) and brown(inside) and when mixed with NaNO2 and NaNO3 the color changed to slight maroon and medium brown and pink.
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