Lab 4 Results pages 022523

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Jan 9, 2024

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Name: Student ID: Date: Lab 4 Results Moles, m&m's, and BB's Record the uncertainties for which blanks are provided. Thereafter, we will assume that the uncertainties are the same for the rest of the values that are measured with that particular device. This will save a lot of tedium. Number of m&m's in the small bag 13 Mass of m&m's in the small bag, g 89.20 ± Average mass of a single m&m, g 6.86 BB Vial # Mass of 50 BB's, g 125.16 Average mass of a single BB, g 2.50 Mass of all BB's in Batch 1, g 842.86 Mass of all BB's in Batch 2 (if needed), g 1,595.8 Total mass of all BB's, g 2,563.82 Calculated number of BB's in the vial 1,025 Counted number of BB's in the vial 1,019 Questions 1. No blank was provided for the uncertainty of the number of m&m's that are in the small bag. Why not? 2. Is your measured mass exactly the same as the mass of the m&m's that is printed on the package? If not, in terms of the mass of a single m&m, explain why the two masses are not exactly the same. its doesn't state the mass on the bag 3. How many m&m's should there be in the party size bag, which supposedly weighs 643.5 grams? Show all of your calculations. 643.5/6.86=93 4. Suppose that you measured the mass of five BB's individually with the balance

that is in your kit. Do you think all five would have the same mass within the limits of the scale in the kit? No because some of the BBs might weight a little different 5. Suppose that you measured the mass of five BB's individually with a $2,000 analytical balance that can be used to measure to the nearest 0.0001 gram. Do you think that all five BB's would have the same mass as determined with the analytical balance? No because some of the BBs might weight a little different 6. Does your calculated value for the number of BB's that are in the vial agree with the counted number to within 1%? Within 5%? within 1% 7. Which value do you think is more reliable, the number that you counted, or the number that you calculated? Why? The number counted because its is the exact number 8. Suppose that your measured mass of the original batch of 50 BB's was 1.00 g larger than the actual value. For example, suppose that you measured 18.05 g, but the true mass was 17.05 g. Would the number of BB's that you calculate for the entire package be larger or smaller than the true value? Larger

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