How many grams of Al(ClO4)3 (Mm=326 g/mol) must be added to 215 g of water to make a solution with a colligative molality of 0.345 m?

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Suppose that a certain fortunate person has a net worth of $71.0 billion ($7.10×1010). if her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?

Who examines and coordinates the cleanup of polluted sites?