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Svet_ta [14]
3 years ago
14

An atom has 20 electrons. Find out

Chemistry
1 answer:
Yanka [14]3 years ago
8 0

Answer:

it's atomic number is 5 and total number is 10

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What does it mean if an element has 8 valence electrons? O A. It has 8 protons. O B. It has a full octet. O O O O C. It reacts v
Goshia [24]

Answer:

i belive its c

Explanation:

Atoms of group 18 elements have eight valence electrons (or two in the case of helium). These elements already have a full outer energy level, so they are very stable. As a result, they rarely if ever react with other elements. Therefore, it is very reactive and gives up electrons in chemical reactions.

4 0
3 years ago
Read 2 more answers
Given a balanced chemical equation between H2SO4(aq) and KOH(aq) H2SO4(aq) + 2 KOH(aq) → K2SO4(aq) + 2 H2O(l) What volume (in mL
Lynna [10]

Answer:

48.84mL

Explanation:

H2SO4 + 2KOH → K2SO4 + 2H2O

From the question:

nA = 1

nB = 2

From the question given we obtained the following information:

Ma = 0.43M

Va =?

Mb = 0.35M

Vb = 120mL

Using MaVa / MbVb = nA/nB, we can easily find the volume of the acid required. This is illustrated below:

MaVa / MbVb = nA/nB

0.43 x Va / 0.35 x 120 = 1/2

Cross multiply to express in linear form

2 x 0.43 x Va = 0.35 x 120

Divide both side by the (2 x 0.43)

Va = (0.35 x 120) /(2 x 0.43)

Va = 48.84mL

Therefore, the volume of H2SO4 required is 48.84mL

8 0
3 years ago
Read 2 more answers
Which of these is not a postulate of the kinetic-molecular theory of gases?
marin [14]

a) Gas particles have most of their mass concentrated in the nucleus of the atom.

b) The moving particles undergo perfectly elastic collisions with the walls of the container.

c) The forces of attraction and repulsion between the particles are insignificant.

d) The average kinetic energy of the particles is directly proportional to the absolute temperature.

e) All of the above are postulates of the kinetic molecular theory.

Gas particles have most of their mass concentrated in the nucleus of the atom.

Answer: Option A.

<u>Explanation:</u>

Kinetic Molecular Theory expresses that gas particles are in consistent movement and show flawlessly versatile crashes. Motor Molecular Theory can be utilized to clarify both Charles' and Boyle's Laws. The normal active vitality of an assortment of gas particles is straightforwardly corresponding to total temperature as it were.

The kinetic theory of gases is a significantly critical, however straightforward model of the thermodynamic conduct of gases with which numerous important ideas of thermodynamics were built up.

6 0
4 years ago
Please help with these two chemistry questions. Image attached.
mars1129 [50]

The answers for the following questions is answered below.

  • Therefore the volume of a gas is 22.4 L
  • <u>Therefore the number of moles of oxygen are 2.37 moles</u>

Explanation:

1. Given:

no of molecules (n) = 6.023 × 10^{23}

volume of gas at STP conditions (V) =22.4 liters

To solve:

Volume of gas (v)

We know;

\frac{n}{N_{a} } =\frac{v}{V}

\frac{6.023 * 10^{23} }{6.023 * 10^{23} }  =\frac{v}{22.4}

1 × 22.4 = v

v =22.4 L

Therefore the volume of a gas is 22.4 L

2. Given:

volume of oxygen gas (v) = 53 L

Volume of gas at STP conditions (V) =22.4 L

To solve:

no of moles of oxygen gas

We know;

n =\frac{v}{V}

n =\frac{53}{22.4}

n =2.37 moles

<u>Therefore the number of moles of oxygen are 2.37 moles</u>

<u></u>

6 0
3 years ago
Using a chemical equation to find moles of product from moles...
kaheart [24]

Answer: 0.600 moles

Balanced eqn for decomposition of the rocket fuel:

2 NH4ClO4 (s) ----> N2 (g) + Cl2 (g) + 2 O2 (g) + 4 H2O (g)

Since, 2 moles of NH4ClO4 produces 2 moles of O2 gas, this means that 0.6 moles of NH4ClO4 will produce 0.6 moles of O2 gas

7 0
2 years ago
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