Strontium-90 has a half-life of 28.8 years. What mass in grams of a 56.0 g sample will remain in the body after 115.2 years? Give your answer to three significant digits. ___ grams

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.