Question

In 1819, Pierre Dulong and Alexis Petit reported that the product of the atomic mass of a metal times its specific heat is approximately constant, an observation called the law of Dulong and Petit. Use the following data to answer the following questions. Mg/mol) Bismuth cs[J/(g.°c)] MX Cs 0.120 0.123 25.5 0.125 Lead Gold 207.2 197.0 195.1 118.7 Platinum Tin 65.4 0.215 0.233 0.388 0.397 0.433 0.460 Copper 63.5 Iron 55.8 32.1 Sulfur Average value: 0 (a) Complete the fourth row in the table by multiplying each given molar mass and specific heat pair (one result has been entered in the table). What are the units of the resulting values in column 4? (b) Next, calculate the average of the values in column 4. (c) Use the mean value from part b to calculate the missing atomic masses in the table. (d) Use the average value from part (b) to predict the missing specific heat values in the table.

Answer 1

)s) ل، 3 / 4 MX CS I J Element Bismuth 0-120 M (g/mol) 210.8 20.7.2 197.0 Lead Gold 25-5 24.6 Platinum 195.1 0-123 0.125 0 130 0-215 0-233 0.388 25.5 ® Silver 118.7 108.6 Zinc 25.4 2502 Co trex Nicke Iron 65.4 63.5 58.4 55.8 0.397 00433 Sulfur 32.1 0.460 2507 0.789 Average Value - 25.3 5 mor Averare value = 25.5+24.6+25°5 +254 +2502+28.7 6 Average value = 1518 = 2503 Average value in column &z 2503 - Missing Atomic Mass: - | Molao Mass) (Cs) = 25-3 - (M Bi) (0.120) = 2503 (Bismuth) Moi = 210.8 g/mol.

MAX 0.233 = 25.3 MA = 108.6 g/mol Approax Silver ® MBX06433 = 2503 [MB = 58.4 g/mol - Approax Nickel To Missing speuhe Heat: - IM x G = 2503 for platinum: 195.13 (s = 2503 = 0.130 for Sulfur: - [cs=0.788]