He put a quantity of tin into a vessel, sealed it, heated it, and opened it to examine the contents, weighing the whole apparatus at various points along the way. The mass of tin before the reaction was 8 onces even. The mass of the air sealed in the vessel with the tin was 15 1/3 grains. After the reaction, the mass of the solids in the vessel (tin plus a black powder) was 3.12 grains more than the mass of the original tin; the mass of the gas within the sealed vessel was 3.12 grains less than the mass of the original air.
a) Using the following conversion factors, express the initial masses of solid and gas and their change in mass in gram units.
1 once = 576 grains exactlyb) Lavoisier did not know it yet, but the reaction was
1 grain = 0.0531 grams
Sn(s) + O2(g) -- > SnO2(s) .Which reactant was the limiting reagent? (Yes, it is pretty obvious, but express the reactant quantities in moles.)
c) What was the mass of SnO2 formed?
d) What was the gas left over at the end?
Back to the Classic Calculations home page |
Back to the top of the Classic Chemistry site |