Ihave two solutions. in the first solution, 1.0 moles of sodium chloride is dissolved to make 1.0 liters of solution. in the second one, 1.0 moles of sodium chloride is added to 1.0 liters of water. is the molarity of each solution the same?

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

What is the name of this hydrocarbon?

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?