Question 1
For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H
2O(l) water is both:
◦ a reactant and the solute
◦ a reactant and the solvent
◦ a product and the solute
◦ a product and the solvent
◦ a liquid and the intermediate
Question 2
Gases emitted during volcanic activity often contain high concentrations of hydrogen sulfide and sulfur dioxide. These gases may react to produce deposits of sulfur according to the equation:

For the complete reaction of 6.41 mol of hydrogen sulfide:
◦ 308 g of sulfur is formed
◦ 410 g of sulfur dioxide is consumed
◦ 231 g of water vapor is produced
◦ 320 g of total products result
◦ 628 g of total reactants are consumed