Hydrogen gas dissolves in palladium with the hydrogen molecules going into the spaces between the metal ions. Determine the molarity, molality, and percent by mass of the H2:Pd solution (d=10.8g/cm)containing 0.94g hydrogen gas dissolved in 215 grams of palladium metal.

Answer 1

% w/w = (Mass H2/total mass)*100
Substitute and solve.
mass H2 = 0.94
mass Pd = 215

mols H2 = grams/molar mass
mass mixture = volume x density. Youhave density and mass, solve for volume.
Then M = moles/L soln.

From those two you can determine
molality = moles/kg solvent

Post your work if you get stuck.