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Question- Calculate the percent by mass of zinc in the post-1982 pennies using following information: the total mass of each penn is 2.500 g, the density of copper is 8.96 g/mL, the density of zinc is 7.14 g/mL, and the mass of a penny if it were 100% copper would be 3.11g
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Although coals is a complex mixture of substances, its elemntal composition can be approximated by the formula C135H96O9NS. Using this formula predict the amount of CO2 released from the combustion of 1.00 x 10^6 metric tons of coal. 1 metric ton ..
Choose the answer in which the three atoms and/or ions are listed in order of increasing EXPECTED size (smallest particle listed first) assuming that the simple shell model of the atom is correct.
The present limit of detection of THC in urine is 20 nangrams (1 nanogram =1*10^-9) per milliliter of urine (1milliliter = 1ML=1*10^-3L). Calculate the molarity of the solution at the limet of dection. Molecular weight of THC is 315 g/mol.
It takes 51.0 J to raise the temperature of an 10.2 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal
automated amino acid analysis of peptides containing either asparagine or glutamine shows ammonia as a product as well
the following shows the connectivity of atoms only. Atoms other than carbon and hydrogen are labeled. how many degree of unsaturation are pressent in the compound. chose one of the following answers
An automobile gasoline tank holds 35 kg of gasoline. When the gasoline burns, 88 kg of oxygen is consumed, and carbon dioxide and water are produced.
An alternate method for determining rate law is to moniter concentration of each reactant continuously over span of rxn. explain no more in 1 paragraph how rate law is derived from data obtained.
If 29.8 mL of 0.102 M acid with a Ka of 0.000015 is titrated with 0.107 M NaOH solution, what is the pH of the titration mixture at halfway to the equivalence point?
Explain what is the final temperature of the block after the evaporation of the alcohol. Presume that the heat required for the vaporization of the alcohol comes merely from the aluminum block as well as that the alcohol vaporizes at 25.
A buffer consists of a weak acid and its conjugate base. For the following pairs, indicate which is the acid and which is the base:
The osmotic pressure of a saturated solution of strontium sulfate at 25 C is 21 torr. What is the solubility product of this salt at 25 C
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