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Bad White [126]
1 year ago
12

An element has 2 neutrons, 2 electrons and 2 protons. Which element does this describe? Is it a neutral atom, isotope, or an ion

? What is the mass number? What is the net charge?
Chemistry
1 answer:
Y_Kistochka [10]1 year ago
4 0

Considering the definition of neutral atom, mass number and net charge, the element is a neutral atom, with a net charge equal to zero and a mass number of 4.

<h3>Neutral atom and ion</h3>

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged.

A neutral atom is one that has no electrical charge because it has the same number of protons and electrons.

In contrast, ions are atoms or groups of atoms that have an electrical charge and are formed by the gain or loss of electrons from the atom.

<h3>Mass number</h3>

The mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:

Mass number = (number of protons) + (number of neutrons)

It is represented by the letter A.

<h3>Net charge</h3>

The net charge corresponds to the algebraic sum of all the charges that a atom possesses.

<h3>This case</h3>

In this case, an element has:

  • 2 neutrons.
  • 2 electrons.
  • 2 protons.

Then, the net charge is calculated as:

net charge= 2× 0 [charge of neutron] + 2× (+1) [charge of proton] + 2× (-1) [charge of electron]

<u><em>net charge= 0</em></u>

This element has no electrical charge, or net charge is zero. Then, the element is a neutral atom.

On the other hand, the mass number is the sum of the number of protons and the number of neutrons. So, in this case:

mass number= 2 protons + 2 neutrons

<u><em>mass number= 4</em></u>

Finally, the element is a neutral atom, with a net charge equal to zero and a mass number of 4.

Learn more about

neutral atom:

brainly.com/question/24652228

brainly.com/question/18242008

brainly.com/question/18330612

mass number:

brainly.com/question/1758023

brainly.com/question/5527493

net charge:

brainly.com/question/24752359

#SPJ1

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What amount of heat (in kJ) is required to convert 19.8 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C
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The total energy required to convert the unknown liquid to gas at the given temperature is 7.215 kJ.

The given parameters;

  • <em>mass of the unknown liquid, m = 19.8 g</em>
  • <em>molar mass of liquid = 83.21 g/mol</em>
  • <em>initial temperature of the liquid, = 19.2 °C</em>
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The total heat required to convert the liquid to gas is calculated as follows;

<em>H = Heat to raise to boiling temp. + Heat to vaporize the liquid + Heat of gas vapor</em>

The heat required to raise the temperature of the liquid to boiling point;

H_1 = mc\Delta t\\\\H_1 = 19.8 \times 1.58 \times (57.3 - 19.2)\\\\H_1 = 1,191.92 \ J\\\\H_1 = 1.1919 \ kJ

The number of moles of the liquid is calculated as;

moles= \frac{19.8 \ g}{83.21 \ g/mol} = 0.238 \ mol

The heat required to vaporize the liquid;

H_2 = n H_{vap}\\\\H _2 = 0.238 \times 22.5\\\\H_2 = 5.355\ kJ

The heat of the gas vapor is calculated as;

H_3 = mc_g \Delta t\\\\H_3 = 19.8 \times 0.932 \times (93.5- 57.3)\\\\H_3 = 668.02 \ J\\\\H_3 = 0.668 \ kJ

The total energy required to convert the unknown liquid to gas at the given temperature is calculated as;

H_{total} = 1.1919 \ kJ \ + \ 5.355 \ kJ \ + \ 0.668 \ kJ\\\\H_{total} = 7.215 \ kJ

Thus, the total energy required to convert the unknown liquid to gas at the given temperature is 7.215 kJ.

learn more here:brainly.com/question/13944094

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