1. When the chemical equation, H2SO4(aq) + Al(OH)3(s) H2O(l) + Al2(SO4)3(aq), is balanced, the stoichiometric coefficients are, respectively,
a) 3,2,6,1
b) 3,2,3,1
c) 2,3,2,1
2. When baking soda (sodium bicarbonate or sodium hydrogen carbonate, NaHCO3) is heated, it releases carbon dioxide gas, which is responsible for the rising of cookies, donuts, and bread. The balanced equation for this process is:
2 NaHCO3 Na2CO3 + H2O + CO2. Calculate the mass of NaHCO3 required to produce 20.5 g of CO2.
a) 39.1 g
b) 8.38 g
c) 78.3 g
d) 157 g |
