1. ibuprofen (c13h18o2) is the active ingredient in many nonprescription pain relievers. each tablet contains 200 mg of ibuprofen, and a typical adult dose is two tablets every six hours.
• determine the molar mass of ibuprofen. show all steps to find the answer.
• calculate the number of moles of ibuprofen in a single tablet. show all steps to find the answer.
• calculate the number of moles of ibuprofen that an adult would have taken if she took four doses of ibuprofen in one day. show all steps to find the answer.
asap need to get this done fast

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

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

Name the element in group 17, period 2. (periodic table)