My grandmother always put mothballs in her closet, E new set in each closet beca

Question

My grandmother always put mothballs in her closet, E new set in each closet because they would ‘disappear' Eventualy she would have to put a Explain what is happening 2. The amount of naphthalene collected is less than that which a student determined by subtraction. Why could there be a smaller amount collected than the amount calculated? 3. 4. If you have a package of beans that weights 1 pound (454 g). You freeze dry and recover the 125 g of solid. What was the difference in mass? What percentage of your beans made of this lost component. 15.4 g proten. 5. In 200. g of beans, there are 30.5 g of carbs, 8.9 g of sugars, 8.3 g fiber, and 1.8 g of fat. What is the percentage of each of these parts of the

Explanation / Answer

Ans. #2. In households, the mothballs (naphthalene balls) are used to deter and kill insects and microbes while storing clothes for longer period (say, storing winter clothes during summer). Mothballs undergo sublimation (the solid phase transforms directly into gaseous phase) at room temperature to establish equilibrium with its gaseous phase. Some of gaseous mothball gradually escapes from the closet or storage container. To compensate the loss of vapor, the equilibrium shifts towards gas phase (following Le Chatelier’s principle) to re-establish the equilibrium between solid and gas phase- that never actually happens because the gas phase always escapes. Therefore, all the solid mothball is gradually lost as gaseous forms. And, is needed to be replaced after certain time span.

#3. Naphthalene sublimes (the solid phase transforms directly into gaseous phase) at room temperature. During the time of its collecting and weight measurement, some of naphthalene would always be lost as gas. Therefore, the collected amount of naphthalene is less than its calculated mass.

#4. Difference in mass = Initial (packaged) mass - Final (freeze dried) mass

                                                = 454 g – 125 g

                                                = 329 g

# % lost component (water) = (Mass lost / Initial mass) x 100

                                                = (329 g/ 454 g) x 100

                                                = 72.47 %

#5. % carbs = (Mass of Carbs / total mass) x 100

                        = (30.5 g / 200 g) x 100 = 15.25 %

% sugar = (Mass of sugar / total mass) x 100 = (8.9 g / 200 g) x 100 = 4.45 %

% protein = (Mass of protein / total mass) x 100 = (15.4 g / 200 g) x 100 = 7.70 %

% fiber = (Mass of fiber / total mass) x 100 = (8.3 g / 200 g) x 100 = 4.15 %

% fat = (Mass of fat / total mass) x 100 = (1.8 g / 200 g) x 100 = 0.9 %

# Note: The remaining mass is water.

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