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 07:40, sadcase85
22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na, so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g
Answers: 1
Chemistry, 22.06.2019 09:10, chloeholt123
How have the greenhouse gasses increased from the year 2000 to 2018
Answers: 2
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