In a titration experiment, 50.0 mL of 0.375 M HI solution is required to neutralize 35.0 mL of Ca(OH)2 solution. What is the concentration of the Ca(OH)2 solution?

A) 0.134 M
B) 0.536 M
C) 34.2 M
D) 0.268 M
E) 68.5 M

2)Sulfuric acid (H2SO4) forms in the following unbalanced reaction:

SO2 (g) + O2 (g) + H2O (l) ? H2SO4 (aq)

Suppose that 64 g of SO2, 160 g of O2, and 1000 mL of H2O (d = 1 g/mL) are mixed and the reaction proceeds with 90% yield. What is the molar concentration of H2SO4 in the resulting solution? (You can assume the final volume of the solution is 1000 mL.)

A) 0.09 M
B) 0.45 M
C) 0.90 M
D) 1.35 M
E) 1.80 M