A bottle of the pain reliever ibuprofen (C 13H 18O 2, molar mass 206.3 g/mol) contains 500 200.-mg tablets. (a) How many moles of ibuprofen does the bottle contain? (b) How many molecules of ibuprofen does the bottle contain?

A chemist invents a new combustion analysis instrument that uses less O2(g) which saves money on each analysis. The improvement is that instead of CO2(g) being formed and trapped, CO(g) is formed and trapped. H2O (g) is also formed and trapped when substances that contain hydrogen are analyzed.(a) The chemist places 2.184 g of an unknown compound of carbon and hydrogen in the new analyzer. 4.627 g of CO (g) and 1.795 g of H2O (g) are produced. Find the empirical formula for the compound.(Molar masses (g/mol): CO = 28.0104, H2O = 18.015) (b) Despite the best efforts of the chemist, the molar mass of the compound cannot be determined (using this method). Clearly explain why this prevents the determination of the molecular formula

Be sure to answer all parts. TCDD, also called dioxin (C H,Cl,O2, molar mass 322.0 g/mol), is a potent poison. The average lethal dose in humans is estimated to be 3.0 x 10- mg per kg of body weight. (a) How many grams constitute a lethal dose for a 91-kg individual? (b) How many molecules of TCDD does this correspond to? (a) X 10 g dioxin (b) x 10 molecules

Sand is mainly silicon dioxide. When sand is heated with an excess of coke (carbon),pure silicon and carbon monoxide are produced.(a) Write a balanced equation for the reaction.(b) How many moles of silicon dioxide are required to form 20.00 g of silicon?(c) How many grams of carbon monoxide are formed when 98.76 g of silicon areproduced?

The combustion of methane is shown in the following reaction:CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) A) If 15.0 moles of CO2(g) is produced, how many moles of methane are required? B) If 20.0 moles of O2(g) are consumed, how many moles of water are produced?

You have 235.5 g of Ba(OH)2   How many moles of barium hydroxide, Ba(OH)2, are present in 235.5  g? How many moles of barium ions are present? How many moles of hydroxide ions are present?

Upon exhalation, a patient still has 2.5 moles of carbon dioxide in their lungs at 23o C (room temperature). How many molecules are present in the patient's lungs?

The molecular formula of aspartame, the artificial sweetenermarketed as NutraSweet®, is C14H18N2O5. (a) What is themolar mass of aspartame? (b) How many moles of aspartameare present in 1.00 mg of aspartame? (c) How many moleculesof aspartame are present in 1.00 mg of aspartame? (d) Howmany hydrogen atoms are present in 1.00 mg of aspartame?

(3)Galactose is found in milk sugar and is used for diagnosing liver function. What is the molecular formula of galactose if the empirical formula is CH₂O and the molar mass is 180 g/mol?

(b) An unknown mass of Na3PO4(s) is dissolved in water to form 50.00 mL of solution. This is Solution A. Then 10.00 mL of Solution A is diluted with water to 50.00 mL. The final solution is Solution B. 20.00 mL of Solution B contains 4.408 x 1020 sodium ions. (NA = 6.022 x 1023 mol-1) Calculate the mass of Na3PO4(s) that was dissolved to form Solution A.