2. 3. for her chemistry experiment, marisol needs 2 liters of a 50% alcohol solution. the lab has two containers, one with 40% alcohol solution and the other with 80% alcohol solution a.) write a system of linear equations that you can use to determine how many liters of each type of alcohol solution marisol should combine to get 2 liters of a 50% alcohol solution. be sure to define your variables. b.) solve the system and determine how many liters of each type of alcohol solution marisol should combine. show all your work. *really need with this i have no clue what to do?

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

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.)

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.