Atomic mass is determined by the number of protons plus the number of _____. a)electrons b)neutrons c)charges d)atoms

Chemistry

2 answers:

antoniya [11.8K]3 years ago

7 0

Answer: Option (b) is the correct answer.

Explanation:

Atomic mass means the sum of total number of protons and neutrons present in an atom. On the other hand, atomic number is only the sum of total number of protons present in an atom.

Generally, when we write symbol of a neutral element denoting its atomic mass and number then atomic mass is placed on the top left corner and atomic number is written on the bottom left corner.

For example, $^{19}_{9}F$ shows atomic mass of fluorine is 19 and its atomic number is 9.

Thus, we can conclude that atomic mass is determined by the number of protons plus the number of neutrons.

Monica [59]3 years ago

6 0

I would believe that the answer is B. Neutrons
Electrons don't have any mass
Charges and atoms don't even make sense in this question

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drek231 [11]

The moles of gas in the bottle has been 0.021 mol.

The ideal gas has been given as the gas where there has been negligible amount of interatomic collisions. The ideal gas equation has been given as:

$PV=nRT$

<h3>Computation for the moles of gas</h3>

The given gas has standard pressure, $P=1\rm atm$

The volume of the gas has been, $V= 0. 500 \;\rm L$

The temperature of the gas has been, $T=15^\circ \text C\\
T=288\;\rm K$

Substituting the values for the moles of gas, n:

$\rm 1\;\times\; 0. 500 =\textit n\;\times\;0.08214\;atm.L/mol.K\;\times\;288\;K\\\\
\textit n=\dfrac{0. 500}{0.08214\;\times\;288} \;mol\\\\
\textit n=0.021\;mol$