1 mole of H2 occupies 22.4L at STP.
So, how many moles of H2 occupy 247mL at the given temperature and pressure?
You have that many moles of M, which is 0.571g
molar mass is g/mole, right?
A 0.571 g sample of a metal, M, reacts completely with sulfuric acid according to
M(s)+H2SO4(aq)⟶MSO4(aq)+H2(g)
A volume of 247 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr, and the temperature is 25 °C. Calculate the molar mass of the metal.
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