The whiye pigment tio2 is prepared by the reaction of titanium tetrachloride, ticl4, with water vapor in the gas phase:
ticl4 + 2h2o2 ? tio + 4hcl
how much heat is evolved in the production of exactly 1 mole of tio2 under standard state conditions?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)