Moles, Avogadro\'s Number and Molar Mass I can\'t get the right number of sigfig

Question

Moles, Avogadro's Number and Molar Mass

I can't get the right number of sigfigs!!!!

Part B: Molar Masses (Counting by Moles) In lab you determined the average masses of popcorn kernels and marbles. One student got the following results. Your values should have been similar. Use this student's results to answer the following questions. (a) What is the mass of one popcorn kernel? (Sig Fig Hint: One dozen can be considered an absolute value that does not impact the number of significant figures in a calculation. Consider the precision of the mass as determining the number of sig figs in the answer.) (b) What is the mass of 6.75 dozen popcorn kernels? (Sig Fig Hint: The 6.75 dozen popcorn kernels can be considered an absolute value that does not impact the number of significant figures in a calculation.) (c) How many popcorn kernels are in a sample that has a mass of 43.035 g? (Sig Fig Hint: The precision of answer (a) will determine the number of sig figs.) (d) What is the mass of one marble? (Sig Fig Hint: One dozen can be considered an absolute value that does not impact the number of significant figures in a calculation. Consider the precision of the mass as determining the number of sig figs in the answer.) (e) What Is the mass of 6.75 dozen marbles? (Sig Fig Hint: The 6.75 dozen marbles can be considered an absolute value that does not impact the number of significant figures in a calculation.) (f) What is the relative mass of a single marble to a single popcorn kernel? (Sig Fig Hint: Consider the precision of the masses of one kernel and one marble to determine the correct number of sig figs.) Using Avogadro's number, 6.02 X10^23 things/mole, answer the following questions. (Use scientific notation for large answers.) (g) What is the mass of one mole of popcorn kernels? (Sig Fig Hint: Consider the precision of Avogadro's number to determine the correct number of sig figs.) (h) What is the mass of one mole of marbles? (Sig Fig Hint: Consider the precision of Avogadro's number to determine the correct number of g figs.) (i) What is the relative mass of one mole of marbles to one mole of popcorn kernels? j) The relative mass of a single marble to a single popcorn kernel the relative mass of a mole of marbles to a mole of popcorn kernels. (Note: The mass of the earth is about 6 X 10^27 g and the mass of the moon is about 7X 10^25 g.)

Explanation / Answer

mass of one dozen popcorn kernels = 1.704 so mass of one mole = (1.704/12)*6.023*10^23 = 8.55 * 10^22 mass of one dozen marbles = 48.240 so mass of one mole = (48.240/12)*6.023*10^23 = 2.4*10^24 relative mass = [2.4*10^24/8.55 * 10^22] = 28.04

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