The density of a gas at S. T.P. is 1.26 grams per liter. What is the mass of this gas in grams per mole? a) 1.26 b) 6.02 c) 17.3 d) 28.2​

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

How many atoms are there in 5.70 mol of mg

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.