3 years ago

Which sample at STP has the same number of molecules as 5 liters of NO2(g) at STP?

Chemistry

1 answer:

scoundrel [369]3 years ago

3 0

The answer is 5 liters of CH4(g).

I hope this helps. :)

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A mole of cars stacked end to end would stretch back and forth across the United States how many times? Measured length of 1 car

vekshin1

Answer:

i am potato

Explanation:

4444141+5-45458/85*55474

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A snowflake contains 2.1 10^18 molecules of water. How many moles of water does it contain?

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2 years ago

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Boron has two isotopes, Boron 10 which has a mass of 10.0129 amu and Boron-11 with a mass of 11.0093 amu. B-10 occurs 84.74% of

podryga [215]

The average atomic mass of Boron: 10.431 amu

<h3>Further explanation </h3>

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu

Mass atom X = mass isotope 1 . % + mass isotope 2.% + ...

The average atomic mass of boron :

$\tt avg~mass=0.8474\times 10.0129+0.1526\times 11.0093\\\\avg~mass=10.431~amu$

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2 years ago