how many grams does one molecule of co2 weight DER Part 2: Avogadro\'s number es
ID: 558674 • Letter: H
Question
how many grams does one molecule of co2 weight DER Part 2: Avogadro's number estimation Although Avogadro's number is a huge number, it is possible to estimate it by a simple experiment. In the experiment a monolayer of stearic acid (SA) molecules is formed on the surface of water. Based on the amount of SA necessary to cover the surface and the given cross- sectional area of one SA molecule, Avogadro's number can be calculated A group of students performed the following experiment using a glass container with the diameter of 14.5 cm. They started by filling up the container with water to the rim. Then they were adding drop by drop stearic acid (SA) on the surface of water. One drop of SA solution was measured to contain approximately 1.4 x 10-6 g of SA. In their experiment students found that 27 drops were enough to create a monolayer of SA on the water surface. In another experiment the cross-section area of one SA molecule in a monolayer was found to be 0.21 nm , The molecular formula of stearic acid is CiaH3602 a) Discuss with your group how you can use the results of this experiment to estimate Avogadro's number. List all the steps in the proposed calculation. Follow the steps to complete the calculation and answer the following question: Do you think the students performed a successful experiment? Explain. b) Hint: use the following formula to calculate surface area of water: surface area of water =Explanation / Answer
From equation ,
1 mol F2 = 2 mol XBr
NO of mol of Br2 reacted = 3.843/80 = 0.048 mol
no of mol of XBr reacted = 2*0.048 = 0.096 mol
molar mass of XBr reacted = w/n = 3.843/0.096 = 40 g/mol
identity of X = potassium(K)
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