A sample of barium hydroxide, Ba(OH)2, is known to have become contaminated with barium carbonate, BaCO3, by reaction with CO2 in the air. A 2.00 g sample is titrated with 0.450M HCI
and it is found that 55.56 mL of HCl are required for neutralization. Calculate the percentage by
mass of BaCO3 in the sample.

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

Which polymers are most closely related? a. protein and nucleic acids b. cellulose and starch c. nucleic acids and starch d. nucleic acids and cellulose