1. In electroplating a silver spoon, how many moles of electrons are required to deposit 10.8g of silver (Ag=108)

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).