25. A sample of helium gas occupies 120 mL at 71 mmHg. For a gas sample at constant temperature, determine the volume of helium at 45 mmHg. Show your work. 26. If one strand of a DNA double helix has the sequence ATCGATCGAT, what is the sequence of the other DNA strand? 27. Polyethylene is a polymer found […]
28. Tantalum (Ta), with a mass number of 185 and an atomic number of 73, decays by beta emission. Identify the product of the nuclear reaction by providing its atomic symbol, mass number and atomic number 29. Platinum (Pt), with a mass number of 190 and an atomic number of 78, decays by beta emission. Identify the […]
30. What is the volume percent of a solution prepared by dissolving 20 g of KOH in enough water to make a final volume of 120 mL? Show your work. How many mL of a 5% solution can be made from the solution in part a? Show your work 31. (a) Given that the molar mass of […]
32. Given the following unbalanced chemical equation: Al + Cl2-> AlCl3, balance the equation. (b, ) How many moles of AlCl3 are produced from 2.5 mole of Cl2? Show your work. (c,) What is the molar mass of AlCl3? Show your work. (d,) Calculate the number of grams of AlCl3 produced from 2.5 mol Cl2. Show your work […]
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