Week 8 : Final Exam - Final Exam CHEM120Final-Exam-Page-3

(TCO 7) (a, 5 pts) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.75L of a 0.25M H3PO4 solution. Show your work. (b, 5 pts) What volume, in Liters, of a 0.25 M H3PO4 solution can be prepared by diluting 50 mL of a 2.5M H3PO4 solution? Show your work. Question: (TCO 7) (a, 5 pts) What is the volume percent of a solution prepared by dissolving 21 g of NaOH in enough water to make a final volume of 120 mL? Show your work. (b, 5 pts) How many mL of a 10% solution can be made from the solution in part a? Show your work. Question: (TCO 11) Tungsten (W), with a mass number of 180 and an atomic number of 74, decays by emission of an alpha particle. Identify the product of the nuclear reaction by providing its atomic symbol , mass number , and atomic number . Question: (TCO 13) What is the mRNA sequence for the following segment of DNA: –AAACGTGTGCTAACA– ? Based upon the mRNA sequence, what is the peptide sequence ? Question: (TCO 5) Given the following unbalanced chemical equation: Al + Cl2- AlCl3 (a, 5 pts) Balance the equation…………(b, 5 pts) How many moles of AlCl3 are produced from 1.75 mole of Cl2? Show your work…………..(c, 5 pts) What is the molar mass of AlCl3? Show your work………(d, 5 pts) Calculate the number of grams of AlCl3 produced from 1.75 mol Cl2. Show your work. Question: (TCO 13) What is the mRNA sequence for the following segment of DNA: –CTCGTGGTTTCATCC– ? Based upon the mRNA sequence, what is the peptide sequence ?