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3 years ago

Read the summary below. Choose the answer that BEST fits into the blank to complete the summary.

Chemistry

1 answer:

777dan777 [17]3 years ago

4 0

Answer:

An atom has a nucleus, made up protons and neutrons, which is surrounded by a cloud of electrons.

Explanation:

An atom is the smallest indivisible part of any element that takes place in a chemical reactions.

These are the fundamental building blocks of every element and even compounds.

There are three known subatomic particles found within an atom.
Electrons are the negatively charged particles in an atom
Protons are the positively charged particles of an atom
Neutrons do not carry any charges.

Both protons and neutrons are located within the tiny space called nucleus at the center of an atom.

Electrons moves round in orbitals at the spaces outside of the nucleus.

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Answer:

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3 years ago

How many moles of O, will occupy 1.00 L at a temper-

Kay [80]

Moles of O₂ = 3.92

<h3>Further explanation</h3>

Given

V=1 L

T=-118 °C + 273 = 155 K

P = 49.77 atm

Required

moles of O₂

Solution

the gas equation can be written

$\large {\boxed {\bold {PV = nRT}}}$

where

P = pressure, atm

V = volume, liter

n = number of moles

R = gas constant = 0.08206 L.atm / mol K

T = temperature, Kelvin

Input the value :

n= PV/RT

$\tt n=\dfrac{49.77~atm\times 1~L}{0.082\times 155}=3.92~moles$

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