The difference in arrival times for P- and S-waves from an earthquake is 5.0 minutes. According to the Earth Science Reference Tables, how far away is the epicenter of the earthquake?

Which terms are used to identify pure substances

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.

What is the molecular formula of ferrous nitrate and ferric nitrate