If the water temperature was 30.0C and the atmospheric pressure was 753 torr. What volume of hydrogen gas would you expect to collect if you reacted 0.083g of Ca metal with HCl?

Answer 1

Ca + 2HCl ==> H2 + CaCl2
mols Ca = grams/molar mass = ?
mols H2 = mols Ca from the equation.

Then use PV = nRT and
V = nRT/P. You know n, R, T. P is 753- vapor pressure H2O at 30 C. You look up v.p. H2O at 30 C in tables in your test. It will be approximately 30 torr.

Answer 2

.053