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Post 1982 Pennies contain the following physical properties:
97.5% zinc
2.5% copper
Total Weight = 2.5 g
The atomic weights for the elements in question are as follows:
Zn: 65.38 g/mol
Cu: 63.546 g/mol
From there we have everything you need to calculate the number of moles of each.
[1] First you want to determine how much (mass) of each element exists within the penny itself:
Zn: (0.975)(2.5 g) = 2.438 g
Cu: (0.025)(2.5 g) = 0.063 g
[2] Next you want to use each atomic weight to determine how many moles of each exist:
Zn: (2.438 g)( 1 / 65.38 g/mol) = 0.038 mol = 3.8 x 10^-2 mol
Cu: (0.063 g)( 1 / 63.546 g/mol) = 9.8 x 10^-4 mol
Please take into consideration significant digits, even though I did not in this case.
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∙ 10y ago
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How many moles of anhydrous copper sulfate is produced when 6.4 moles of hydrated copper sulfate is heated?
1020g
How many American copper pennies in 1 pound?
10000 pennies equals one pound.
If you had 3.5 x 10-16 moles of pennies how many would you have?
1 mole is 6.022*1023 atoms, avagradro's number. 1 mole of pennies is equal to 6.022*1023 pennies. 3.5*10-16 mol pennies * 6.022*1023 pennies/1 mol pennies = 210,770,000 pennies If you had 3.5*10-16 moles of pennies, you would have 2.1077*108 pennies.
How many moles of copper are equivalent to 3.44x10 to the 23 power atoms of copper?
One mol of copper is 6.02 x1023 atoms. So 3.44 x 1023 would be 0.571 moles.
How many moles of copper will react with 4 moles of sulfuric acid?
4. The chemical equation is Cu + H2SO4 → CuSO4 + H2. Copper and sulfuric acid have the same coefficient (1), so the same number of moles of copper and sulfuric acid are used.
How many pennies in a pound of copper?
145 pennies (pre 1982) 181 (1982 and beyond). 1982 and newer pennies contain mostly zinc and pre 1982 pennies are 95% copper. Some 1982 pennies are 95% copper but not all so if you're buying for copper content stick with pre 1982 to be on the safe side. The above mentioned is pennies in a pound. to figure out pennies "in a pound of copper you must multiply "for pre 1982" 145 X 95% "copper content. Since your 5% short of copper per penny you multiply 145 X 5% to get 7.25. Add 145 to 7.25 to get 152.25 pre 1982 pennies in a pound of copper.If you mean how many pennies can you make from one pound of copper the answer is:There is 2,5% copper in the penny (the rest is mostly zinc)so you need 40 pounds of pennies to have one pound of copper.Each penny weighs 0,080 troy ounces40 pounds is 583,33 troy ounces (see why I like the metric system?)583,3 / 0,8 = 7291.66...About 7293 pennies (almost seventy three dollars in pennies)(some will be used and have corroded if that makes a difference... I do not know)
How many percent of copper in pennies?
Lincoln cents post-1982 are only 2.5% copper (the balance is zinc). Lincoln cents pre-1982 are 95% copper (except 1943, which are steel coated with zinc). 1982 Lincoln cents can be either type.
What dates of us pennies are not all copper?
Pennies are supposed to be all copper through 1981. In 1982 some are and some are not, and after 1982 all are clad.CorrectionThe last 100%-copper cents were struck in 1857. Since then the composition of the cent has been changed many times, starting with a copper-nickel alloy from 1857 to 1864, then various varieties of bronze (95% copper), steel (1943), and eventually copper-plated (not clad) zinc beginning in mid-1982.
How many 1982 pennies were manufactured?
In 1982, the United States Mint produced over 10 billion pennies. This includes both the copper (95% copper, 5% zinc) and zinc (97.5% zinc, 2.5% copper) versions. The exact number of 1982 pennies manufactured is not readily available.
How many copper pennies equal a pound?
240 copper pennies equal a pound.
How many pounds of Pennys equals one dollar?
Presuming that you are asking about US Lincoln pennies, the answer is that it depends. If the pennies are pre-1982, they are 95% copper and 5% zinc and weigh 147 to the pound. If the pennies are post-1982, they are 2.5% copper and 97.5% zinc and weigh 181 to the pound. In 1982, both types were made. In 1943, pennies were made from steel coated with zinc (so-called "silver pennies" or "steel pennies") and in 1944 (and I think 1945 as well) from old brass shell casings, so their counts would be a bit different.
How many moles of copper are in 180 grams?
2.83 moles
How many pennies does it take a copper bar?
You need to know 2 things - what is the weight of the copper bar, and what are the dates on the pennies?The reason you need to know the dates is that pennies have very different amounts of copper in them depending on when they were made. Lincoln cents from 1909 till 1942, and from 1944 to the middle of 1982 were made of 95% copper and weighed 3.11 grams, so each one has 2.955 gm of copper in it. But pennies made from the middle of 1982 to the present are mostly zinc - they weigh 2.5 gm and are 2.5% copper, so the only contain 0.0625 gm of copper apiece.That means if you have modern (1983 and later) pennies, you'd need A LOT of them. Say the bar weighs 500 gm. You'd need 500 / 0.0625 = 8000 pennies ... plus you'd have to melt them down and separate the zinc from the copper first!
How many moles of anhydrous copper sulfate is produced when 6.4 moles of hydrated copper sulfate is heated?
1020g
How many pennies equal a pound of copper?
Depends on the dates. Before 1982, Lincoln cents were 95% copper and weighed 3.11 gm. After 1982, Lincoln cents are 2.5% copper and weigh 2.50 gm. A pound is 453.6 gm so figure out how much copper is in each type of cent and divide into 453.6.
How many copper pennies does it take to make a pound?
In 1 pound of pre-1982 copper pennies, there are approx 448 grams of weight. Knowing that a copper pre-82 penny weighs 3.11 grams, simply divide the approx 448 grams in 1 pound by the individual penny weight of 3.11grams. The answer to"how many copper pennies does it take to make a pound" is this.It would take 144.05144 copper pennies to weight 1 pound........give or take a couple.One copper cent weighs 3.11 grams, and one pound is 453.59 grams. Do the math, and it comes out to 146 copper cents per pound.
How many moles are in 6000000 atoms of copper?
Approx. 10e-17 moles.
