1. pretend that a store has a huge jar of pennies that weighs exactly 25 kg (25,000 g). the person who comes
closest to guessing how many pennies are in the jar wins it.
if the actual abundance of pre-1982 and post-1982 pennies in circulation is the same as the numbers
from your sample, how many "atoms” of pennium (pennies) should there be in 25,000 g jar of
pennies. show your work!
2. you have been given a new sample of the element 'pennium' (pn), and you know that this sample has 55
atoms in it and that the total mass of the sample is 155.5g. you also know that there are two isotopes of
pennium, pennium-2.5 and pennium-3.1. it is your job to figure out how many atoms (of the 55 in your
sample) are of the isotope 2.5 and how many are of the isotope 3.1.
Answers: 2
Chemistry, 22.06.2019 11:00
The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.
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Chemistry, 22.06.2019 13:30
What produces wave a)sound b) heats c)transfer of energy d)vibrations
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Chemistry, 22.06.2019 14:00
In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2
Answers: 1
Chemistry, 23.06.2019 00:30
The molecular weight of carbon dioxide, co2, is 44.00 amu, and the molecular weight of nitrous dioxide, no2, is 46.01 amu, so no2 diffuses co2
Answers: 2
1. pretend that a store has a huge jar of pennies that weighs exactly 25 kg (25,000 g). the person w...
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