A murexide solution at 25 seconds has a transmittance of 51.65%. What is the absorbance value of the solution at this time?

What element breaks down into yttrium-90?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.