Can someone me on these two questions 25pts
1. pretend that a store has a huge jar of pennies...
Chemistry, 30.08.2019 03:00 peytondavis2424
Can someone me on these two questions 25pts
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 02:50
What is the overall order of reaction for rate = k[no]2[o2]
Answers: 3
Chemistry, 22.06.2019 09:00
The diagram below shows a cell placed in a solution.a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution.only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it.it will expand as water moves into it. it will shrink as water moves into it.
Answers: 2
Chemistry, 22.06.2019 10:50
How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)
Answers: 2
History, 24.03.2021 06:00
Physics, 24.03.2021 06:00
English, 24.03.2021 06:00
Mathematics, 24.03.2021 06:00
Chemistry, 24.03.2021 06:00
Mathematics, 24.03.2021 06:00
English, 24.03.2021 06:00
Biology, 24.03.2021 06:00
Mathematics, 24.03.2021 06:00
Mathematics, 24.03.2021 06:00
English, 24.03.2021 06:00
French, 24.03.2021 06:00