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It depends on their dates. Cents minted in 1981 and earlier are made of copper and weigh 3.11 gm. Cents minted in 1983 and later are made of copper-plated zinc and weigh 2.5 gm. Cents minted in 1982 can be made of either metal. 1 lb = 453.6 gm so decide what kind of penny you're using and grab your calculator.
1.5 gm = 1,500 mg
1963 US dimes, quarters, and half dollars were made of an alloy of 90% silver and 10% copper. The alloyed and pure silver weights of these coins were: Dime: 2.5 gm / 2.25 gm Quarter: 6.25 gm / 5.625 gm Half: 12.5 gm / 11.25 gm
Amorphous polypropylene has a density of 0.855 gm/cm3. To convert to gm/cubic inch, 0.855 gm/cm3x16.39 cm3/cubic inch = 14.0 gm/cubic inch
NOTHING ... gm sucks !