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Moles In this experiment you will use grains of rice as an analogy for atoms and experience why chemists find moles useful as a unit. How many grains of rice fit in a 50 mL beaker? You probably don't want to count them all, just as chemists don't want to count atoms-but if we had a relationship between mass and the number of grains of rice, we could easily calculate the answer. How many grains do you guess would fit in the 50 mL beaker? \.500 Now, start by determining the average mass of a single grain of rice: Count out 10, 30, and 50 grains of rice and use a weigh boat to determine the total weight of the rice. Trial 1 Trial 2 Trial 3 10 30 50 Number of grains of псе: boat: 0.Co 323 0.c6323/0.16323 grains: 0.81041.1702 rice grains: 0.7810.53790.8966 Mass of empty 1.5289 Mass of boat + rice *Mass of only the *Mass per single grain of rice: O, O 6210.01620.0162 1. Which value for the mass per grain of rice do you think is the most reliable, and what makes it the best? 2. Use your most reliable value for the mass per grain of rice to determine the Gross Mass of the rice: the mass of a gross (a dozen dozen, or 144) of rice grains. Your unit should be grams/gross. grams/gross

Moles In this experiment you will use grains of rice as an analogy for atoms and experience why chemists find moles useful as a unit. How many grains of rice fit in a 50 mL beaker? You probably don't want to count them all, just as chemists don't want to count atoms-but if we had a relationship between mass and the number of grains of rice, we could easily calculate the answer. How many grains do you guess would fit in the 50 mL beaker? \.500 Now, start by determining the average mass of a single grain of rice: Count out 10, 30, and 50 grains of rice and use a weigh boat to determine the total weight of the rice. Trial 1 Trial 2 Trial 3 10 30 50 Number of grains of псе: boat: 0.Co 323 0.c6323/0.16323 grains: 0.81041.1702 rice grains: 0.7810.53790.8966 Mass of empty 1.5289 Mass of boat + rice *Mass of only the *Mass per single grain of rice: O, O 6210.01620.0162 1. Which value for the mass per grain of rice do you think is the most reliable, and what makes it the best? 2. Use your most reliable value for the mass per grain of rice to determine the Gross Mass of the rice: the mass of a gross (a dozen dozen, or 144) of rice grains. Your unit should be grams/gross. grams/gross

Chemical Principles in the Laboratory
Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter4: Determination Of A Chemical Formula
Section: Chapter Questions
Problem 2ASA: If one can find the ratio of the number of moles of the elements in a compound to one another, one...
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Namé: Moles In this experiment you will use grains of rice as an analogy for atoms and experience why chemists find moles useful as a unit. How many grains of rice fit in a 50 mL beaker? You probably don't want to count them all, just as chemists don't want to count atoms-but if we had a relationship between mass and the number of grains of rice, we could easily calculate the answer. How many grains do you guess would fit in the 50 mL beaker? 1.500 Now, start by determining the average mass of a single grain of rice: Count out 10, 30, and 50 grains of rice and use a weigh boat to determine the total weight of the rice. Trial 1 Trial 2 Trial 3 Number of grains of 10 30 50 rice: boat: 0. Ce 323 0.c6323.0.16323 grains: 0.81041.1702 rice grains: O.781 10.5379 0.8966 Mass of empty 1.5289 Mass of boat + rice *Mass of only the *Mass per single grain of rice: O, O 1l6210,0162 10.0162 1. Which value for the mass per grain of rice do you think is the most reliable, and what makes it the best? 2. Use your most reliable value for the mass per grain of rice to determine the Gross Mass of the rice: the mass of a gross (a dozen dozen, or 144) of rice grains. Your unit should be grams/gross. grams/gross
Transcribed Image Text:Namé: Moles In this experiment you will use grains of rice as an analogy for atoms and experience why chemists find moles useful as a unit. How many grains of rice fit in a 50 mL beaker? You probably don't want to count them all, just as chemists don't want to count atoms-but if we had a relationship between mass and the number of grains of rice, we could easily calculate the answer. How many grains do you guess would fit in the 50 mL beaker? 1.500 Now, start by determining the average mass of a single grain of rice: Count out 10, 30, and 50 grains of rice and use a weigh boat to determine the total weight of the rice. Trial 1 Trial 2 Trial 3 Number of grains of 10 30 50 rice: boat: 0. Ce 323 0.c6323.0.16323 grains: 0.81041.1702 rice grains: O.781 10.5379 0.8966 Mass of empty 1.5289 Mass of boat + rice *Mass of only the *Mass per single grain of rice: O, O 1l6210,0162 10.0162 1. Which value for the mass per grain of rice do you think is the most reliable, and what makes it the best? 2. Use your most reliable value for the mass per grain of rice to determine the Gross Mass of the rice: the mass of a gross (a dozen dozen, or 144) of rice grains. Your unit should be grams/gross. grams/gross
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