The atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. what is the pressure in atm? give your answer to 2 significant figures. ___ atm

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining