Balance the following equation and then answer the following question. How many molecules of carbon dioxide are produced when the following reaction occurs? C2H50H (aq) +_ 02 (g) →_ CO2 (g) + _ H20 (g) 3. 4.

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

How many atoms are there in 5.70 mol of mg

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.)